15 Best saltwater fish tank cleaners (2024)

Let’s face it, keeping any aquarium clean can be a pain. There is no perfect biological solution that will make your tank completely maintenance-free, but adding a few of the best saltwater fish tank cleaners can help add some interesting dynamics to your tank and lend a helping hand.

Here are the 15 best saltwater fish tank cleaners:

Crabs are some of the best saltwater fish tank cleaners

The reef-safe saltwater crabs have to be at the top of the list when it comes to helping keep your saltwater fish tank clean. These scavengers naturally occupy this important niche and are happy to lend a hand…er…I mean claw in support of keeping things neat and tidy.

Here are three great crabby options and are my favorite of all the best saltwater fish tank cleaners:

Hermit crabs are the most common, inexpensive, and best saltwater fish tank cleaners

You cannot beat hermit crabs, when it comes to helping keep a saltwater aquarium clean and tidy.

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These tiny little acrobats will find their way into all the nooks and crannies of your tank or your English muffins, wherever you have nooks and crannies. They eat leftover food, detritus and algae, making them one of the most versatile cleaners on this list.

They are also generally inexpensive. Just don’t buy too many of them, you don’t want them to starve.

Emerald crabs help keep a tank free from algae

This green mithrax emerald crab is a gem, when it comes to fighting hair algae. They are so good at cutting down this problem algae that they can often starve in a tank, once the job is done.

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The image above is of an Emerald crab I added to my tank in 2021 to help tame some hair algae issues I was having. The hair was growing in between the frogspawn heads, making it particularly challenging for me to fight. But the crab took up residence among the branches and dined away to it’s little crabby heart’s content.

Arrow crabs will clean up unwanted invertebrates like bristle worms

Arrow crabs are somehow creepy-looking and cool at the same time. They look like giant water spiders. They’ll spend their days picking food out of the rocks.

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Arrow crabs will also help keep the invertebrate population down in your sandbed. If you are not a fan of hitchhiking invertebrates, like bristleworms, then you should consider adding an arrow crab.

Snails will eat algae off glass and other surfaces

Two of the best saltwater fish tank cleaners are Cerith and Trochus snails. They are widely available, relatively inexpensive and great at fitting into those tighter spaces to help keep things clean.

Cerith snails

These tiny, tidy titans are versatile cleaners that will help you keep your saltwater fish tank clean.

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Cerith snails are one of my favorite saltwater fish tank cleaners because of the variety of things they will eat, to help keep your tank clean, as well as their small size.

Some of the other mollusks, like the Turbo snail, or the fighting conch grow so large that they actually knock corals and rocks over in your tank.

But the cerith snail packs a lot of cleaning in a tiny package.

Trochus snails

Trochus snails are a close second to the Cerith snails, when it comes to clean-up-crew potential.

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The are a bit larger, which also makes them fun and different to watch. Cerith snails almost seem nimble and agile, whereas trochus snails can sometimes look clumsy. Watching them rasp-away at the aquarium glass can be a bit mesmerizing.

Shrimp

Shrimp are some of the best saltwater fish tank cleaners. They will eat excess foods and even parasites, if you’re lucky.

Peppermint shrimp

The peppermint shrimp is a great cleaner, because they are inexpensive, and they will also help keep aiptasia anemones in line.

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Cleaner shrimp

Cleaner shrimp will eat leftover food and keep your rocks and coral branches free from rotting food and detritus and they also will display an amazing behavior that is even more entertaining than it is beneficial for your fish.

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Starfish

Starfish might be the most controversial choice on this list–because they can sometimes eat something of value in your tank, while they are keeping it clean.

As you can imagine, starfish are great cleaners. They’re like little living roomba vacuums for your tank.

Reef safe starfish

Before you go out and buy a starfish, I do recommend you read this article about reef safe starfish and educate yourself about the pros and cons.

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Sea slugs and Nudibranchs

Berghia nudibranch

The berghia nudibranch is a specialized cleaner that does only one thing. They are great for helping clean up the nasty and dramatically unpopular aiptasia anemone. If you have aiptasia, you can get hours of fun watching them track down and munch on that dreaded hitchhiker.

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Unfortunately, they aren’t any good at mowing down majano anemones. So be sure to know the difference before you invest in these crazy-looking creatures.

The dolabella sea hare is another interesting fish tank cleaner choice. I didn’t include them in a prominent way here, because they are a bit more of an expert-level type invertebrate. But they certainly are great at eating algae and keeping your tank clean.

Macroalgae

Believe it or not, Macroalgae are actually one of the best saltwater fish tank cleaners. The strategy is a bit like fighting fire with fire.

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Fast-growing, nutrient hungry macroalgae, grown strategically in a sump or refugium can help keep your tank clean.

The only caution with macroalgae is that if you’re not careful, they could actually become their own version of a problem algae.

I used to have some caulerpa, like the macro shown in the image above, that grew in my deep sand bed years ago. It was really hard to finally rid myself of it, once I decided to get rid of it. The stalky body sends out these little shoots that get into crevices and keep popping up new macro shoots.

The hitchhikers: natural saltwater fish tank cleaners that find their way into your aquarium

Some of the absoultely best saltwater fish tank cleaners will find their way into your tank without you even trying. They find their way into your tank on live rock, corals and coral frags and they’re absolutely created, evolved and built for cleaning up unwanted waste.

Bristle worms

They aren’t much to look at, but these gross-looking detrivores do a great job at cleaning up the unwanted stuff that falls to your aquarium floor. Bristle worms also generally do their work overnight, when you’re not awake. They’re like having a cleaning crew for your tank and you don’t even have to pay for them.

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Stomatella snails

Stomatella snails are another stowaway hitchhiking cleaner that will reproduce in your tank and help keep things clean.

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Pineapple sponges

Having pineapple sponges in your saltwater tank is a sign that you’re doing things right. Sponges are versatile, survival machines. Each cell could potentially create an entirely separate sponge colony somewhere else. But pineapple sponges generally don’t proliferate in your tank unless conditions are strong and stable.

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The great part about pineapple sponges is that they are literal biological filters. Their entire way of existing is to suck water in and filter out the particles, cleaning your water in the process.

Saltwater fish

Lawnmower blenny

There are not many saltwater fish that can rival the Lawnmower blenny for their tank-cleaning abilities. As their name implies, they cut down problem algae blooms by constantly grazing.

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The pot-bellied blenny in the image above helps keep my aquairum clean. As I mentioned earlier, none of the cleaners in this list will be able to keep your tank completely clean without maintenance, but some of them will go about their days and nights on a relentless pursuit of eating while they clean.

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The picture above is from my own aquarium–and admittedly–the glass needs a cleaning, but take a look at all those lipstick marks. You can see the mouth imprint of the lawnmower blenny. This fish rasps hundreds of spots completely clear of algae each and every day.

Kole tang

The Kole tang is the iconic, most popular member of the bristletooth tang family. Kole tangs are gorgeous tropical fish and voracious algae-eaters, making them one of the best overall tangs to add to your tank as well as one of the best saltwater fish tank cleaners.

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What to read next

I hope you enjoyed this article about the 15 best saltwater fish tank cleaners. Here are a few related articles to help dive deeper on the topics of creating and maintaining a healthy saltwater tank.

23 Interesting clean-up-crew invertebrates that eat algae

The 21 Best algae-eating saltwater fish

The best saltwater fish for a 15-gallon tank

Conclusions

Adding a few saltwater fish tank cleaners to your tank won’t completely replace your need to do some routine maintenance tasks, like cleaning the aquarium glass and performing partial water changes, but they certainly will help you keep things a bit neater, while also adding some amazing, beautiful and interesting natural behaviors to watch.

Many of the animals listed here are beautiful in their own right. The fact that they are also born to chip in and help keep things clean is icing on the cake.

Comments and questions

Do you have any comments or questions about this list? If so, please type it in the comment section below.

15 Best saltwater fish tank cleaners (2024)

FAQs

What is the best saltwater fish tank cleaner? ›

Here are six of the best:
  • Reef safe Hermit crabs. There are dozens of hermit crab species available, but make sure you only buy the small species which are reef safe. ...
  • Sand sifting snails, Nassarius spp. ...
  • Algae eating snails for reef tanks. ...
  • Emerald crab, Mithrax crab. ...
  • Sea hare. ...
  • Sand sifting starfish.

What is the best clean-up crew for a marine tank? ›

Having an in-tank clean-up crew that continuously focuses on algae removal can be a big help in keeping that algae problem under control. Crabs, snails, starfish, urchins and sea cucumbers along with utilitarian fish like blennies and tangs are your best defense against nuisance algae.

What fish are glass cleaners for saltwater tanks? ›

Surgeonfish make great reef tank glass and rock cleaners. Being herbivores, they eat only algae and leave your corals alone. However, some tangs can get too large for small tanks.

What kills algae in saltwater tank? ›

Granular ferric oxide (GFO) adsorbs phosphate from the aquarium water, starving the algae and causing it to die back. Replace the GFO every 2-3 months to keep the phosphate level low.

What is the best way to remove algae from saltwater tank? ›

Remove excess amounts of algae by hand, siphoning or filtration. Adjust the lighting intensity higher or lower, depending on the type of algae present (with green algae - use less light; brown algae - use more light). Remove excess nutrients (DOCs) through protein skimming. Reduce nitrate and phosphate.

How do I make my marine tank crystal clear? ›

Chemical filtration for aquariums. Chemical filtration works by absorbing or adsorbing things from the water. Activated Carbon is by far the best known chemical filter media and is widely used to get crystal clear aquarium water.

How many clean-up crew do I need? ›

As a general rule of thumb, use one clean-up crew member for every 3 gallons of water in a new tank and two clean-up crew members for every 3 gallons of water in an established tank. However, stocking levels can vary depending on the tank's footprint and the tank inhabitants and bioload.

What is the best clean-up crew for a 20 gallon reef tank? ›

For a 20-gallon tank, I typically start with 10 snails, one cleaner shrimp, and two hermit crabs. Five snails are herbivores and will clean the glass and rock, and the other five snails are detritivores and live in the sandbed and eat extra food and fish waste.

What eats algae on glass in saltwater tank? ›

The most commonly offered for the job are the blue-legged hermit crab (Clibanarius tricolor), scarlet hermit crab (Paguristes cadenati), blue-knuckle hermit crab (Calcinus laevimanus), and red-leg hermit crab (C. tibicen). They will all eat microalgae and filamentous algae, in addition to leftover fish foods.

What fish cleans its own tank? ›

Suckermouthed catfish like Common and Sailfin Plecos, Bristlenose and Otocinclus all graze algae and will “clean” the tank of it, but they do also need food in their own right if they are to grow, stay healthy and thrive.

Which Goby is the best for sand sifting? ›

The Tiger Watchman Goby (Valenciennea wardii) (also known as the Ward's Sleeper, Ward's Tiger, or Tiger Sleeper Goby) is a favorite among reef tank enthusiasts. The Tiger Watchman Goby stirs the sand as it sifts through it, straining out food.

What does vinegar do for saltwater tank? ›

The mild acid in the household staple can help lower nitrates in your tank by boosting the growth of the beneficial bacteria living and thriving within your little ecosystem. Those bacteria then chomp down on the nitrates. Dosing small amounts of vinegar slowly over time acts as food/fuel for beneficial bacteria.

How often do you need to clean a saltwater tank? ›

The most important routine maintenance chore—the partial water change—should be completed once every two weeks or, at the very least, once a month. In heavily populated tanks or tanks containing large specimens that excrete on the heavy side, weekly water changes would be even better.

What is the brown stuff on the bottom of my saltwater tank? ›

Well, diatoms are a brown algae that typically appear in a reef tank that has just completed its cycle but they can also appear in an established reef tank. They can cover sand, rock, pumps, glass, you name it. Diatoms look ugly but in most cases they are harmless so the key is to not panic when they appear.

What kills algae immediately? ›

Chlorine is still one of the most effective killers of algae so doing a super-chlorination of 10-20 ppm of chlorine can go a long way towards wiping out the algae. Liquid chlorine is an ideal shock for algae because it is fast acting and does not add cyanuric acid (CYA) or calcium to the water.

What kills algae without killing fish? ›

Barley straw is another plant product that destroys algae growth. This solution takes time, but it is completely harmless to fish and uses no chemicals. You place the barley straw in the water and it decomposes over a few months, depending on the temperature of the pond water and how oxygenated it is.

What kills algae besides chlorine? ›

Grab a brush and some baking soda. Bicarbonate, the active ingredient in baking soda, is an effective spot treatment to help kill the algae and loosen it from the wall. Make sure you really get every last particle free; black algae has particularly long and stubborn roots which makes it a persistent strand.

Why does my saltwater tank get algae so fast? ›

Algae are plants and thrive in environments rich in water, light, and nutrients. This makes aquariums the perfect breeding ground. Too much light or too many nutrients in the water will cause algae to grow rapidly.

How do I get tough algae off my fish tank? ›

The best way to tackle algae is to actually get your hands in the tank and manually remove as much as you can. Use an algae pad or algae scraper on the glass daily, and brush plant leaves and decor too.

Why does my saltwater tank have so much green algae? ›

Nutrient Imbalance

For most algae that means nitrate and phosphate, which typically come from fish food and fish waste, but they can be in tap water as well. Overfeeding and/or having too many fish for your tank size or filter capacity also lead to a build-up of nutrients.

What is the best crystal to put in a fish tank? ›

Rock crystals such as Quartz (including Rose Quartz, Smokey Quartz, Apricot Quartz, etc.), Jasper, Citrine, Jade, Ametrine, Tiger's eye, Amethyst, Agate, Black Tourmaline, and Petrified Wood are all considered safe additions to your aquarium.

Will protein skimmer clear water? ›

On top of removing organic matter, protein skimmers do a great job aerating the water.

How do you clear a cloudy marine tank? ›

At this point, we'd recommend removing some of the tank water and replacing it with clean saltwater. You could also increase the supply of dissolved oxygen through your air pump. This is a quick and safe way to reverse the cloudiness in your marine tank.

Should I add clean-up crew or fish first? ›

When Should I Introduce my Cleanup Crew? If you are cycling your saltwater aquarium with live rock (as most saltwater aquarists do) then you will want to add the cleanup crew right after the cycle is complete (before you add fish).

How to do a full system cleanup? ›

Open Disk Cleanup by clicking the Start button . In the search box, type Disk Cleanup, and then, in the list of results, select Disk Cleanup. If prompted, select the drive that you want to clean up, and then select OK. In the Disk Cleanup dialog box in the Description section, select Clean up system files.

What clean-up crew eats cyanobacteria? ›

Trochus and Cerith snails are the best inverts to purchase to eat it, most other crabs and snails will not touch this bacteria. But, these two will quickly clean a light bloom and keep your tank looking clean while you work to find the problem.

What is considered heavy bioload in reef tank? ›

If your tank is full of fish and corals, you have a heavy bioload. A moderately stocked tank is considered a medium load and a tank with only a few fish would be considered a light bioload.

How long does it take to cycle a 20 gallon saltwater tank? ›

The cycling process usually takes six to eight weeks.

After about eight weeks, your ammonia and Nitrite levels should be acceptable (about trace levels), and you can add more fish. Do not add more fish until the ammonia and Nitrite levels have both dropped.

What eats dead algae in a reef tank? ›

Sea urchins act as scavengers and will also eat dead algae that they find. Some sea urchins, such as the variegated sea urchin or the red sea urchin, have become popular as pets for home aquariums because of their ability to proficiently eat algae.

What are the tiny worms on the glass of my saltwater tank? ›

Planaria are flatworms in the class Turbellaria; they are found in both freshwater and saltwater environments the world over. They are quite small, but if you can examine them closely enough, you'll see eyespots as well as protrusions on both sides of their widened heads.

What are the white bugs on my saltwater tank glass? ›

Do you have tiny white "bugs" swimming in your saltwater aquarium? You are probably seeing copepods or amphipods. These tiny, shrimp-like crustaceans dwell in marine substrate as adults, but during their larval and juvenile stages, they swim freely through the water.

What eats hair algae in aquarium? ›

Algae with softer filaments are eaten by invertebrates like Amano shrimp and most dwarf shrimp species. Even snails like the highly popular ramshorn snails will go after the filamentous hair algae coats.

What fish cleans sharks teeth? ›

The shark and remora relationship benefits both species. Remoras eat scraps of prey dropped by the shark. They also feed off of parasites on the shark's skin and in its mouth. This makes the shark happy because the parasites would otherwise irritate the shark.

What is the rarest goby in the world? ›

Perhaps the rarest goby on earth is known from a single male specimen collected by Curasub (a 5-man diving submarine outfitted for reef fish collection and research) between 374–449 feet (114–137 m) in Bonaire in 2013, hiding out in a glass bottle found along a sandy slope well below the usual safe scuba-diving range.

What is the best goby for beginners? ›

The Yellow Watchman Goby is one of the best fish for saltwater aquarium beginners because they are not picky about their diet and will eat food readily available at the pet store, are inexpensive, and hardy. Goby fish are also popular, so they are easy to find in many pet stores.

What is the best starfish for cleaning sand? ›

When it comes to cleaning the sand bed, the Sand Sifting Starfish, Astropecten polyacanthus, is unparalleled in its effectiveness. Also known as the Comb Starfish, White Starfish, and Sand Starfish, this species works wonders in home aquariums for its sifting and cleaning of the sand.

What does hydrogen peroxide do in saltwater aquarium? ›

#6 - Hydrogen Peroxide

Many corals tolerate the peroxide, even directly on the tissue. Some reefers use peroxide as a coral dip to remove algae from frags. At the same time, do your best to avoid spraying your coral. Peroxide will not kill the roots of the algae so it can and will grow back if left alone.

How much vinegar should I put in my reef tank? ›

In my experience, I started with using 15mL vinegar per 100 gallons of water volume and had no problems. I increased weekly by 15mL vinegar per 100 gallons up to 45mL per 100 gallons. Perhaps dosing higher vinegar amounts if necessary will work as well. Watch for bacterial blooms in the tank water.

How often should I change my saltwater filter? ›

Be sure to replace the filter media at least every three to four weeks and give the filter housing a quick rinse. If any algae or debris has accumulated in the intake tube, clean that as well.

How long should I let my saltwater tank cycle? ›

It may take a saltwater tank longer to cycle compared to a freshwater tank. Keep in mind you'll want to allow for at least six weeks for your tank to cycle before purchasing all the fish you will want.

How often should I change carbon in saltwater tank? ›

Carbon will become exhausted, for the most part, within the first week of use inside a reef tank. For this reason, we suggest replacing carbon every 1-2 weeks alongside your regular scheduled maintenance (water changes).

What eats brown algae in saltwater tank? ›

Saltwater/Marine Species that Eat Brown Algae

Trochus snails – genus of marine snails with a conical shell. They are great at cleaning up diatoms on all tank surfaces. They're also a cool species because they can right themselves if they get flipped over, unlike many other snail species.

What eats brown hair algae in saltwater tank? ›

An algae blenny or a Starry blenny may also be effective, or a combination of algae eaters like tangs, rabbitfish and blennies in large reef aquaria.

Does brown algae mean my tank is cycled? ›

While a brown algae outbreak does not mean that your tank is cycled, it definitely means that you're well on your way. For annoying as algae outbreaks might seem, they are a sure sign that things are happening in your tank and that soon enough you will be able to add the fish and invertebrates of your dreams!

Should I use distilled or purified water in reef tank? ›

As mentioned previously, distilled water and R/O water are preferred. Any advanced reef keeper will attest to this statement. If conditioned tap water is your only option, you may be limited to fewer types of hardy corals and invertebrates.

What algae is best for saltwater tank? ›

Generally speaking, Diatoms or brown algae are one of the few algae that are good for your aquarium because they produce oxygen. How do you prevent Diatoms (Bacillariophyta/Brown Algae)? Limit the nutrients in your saltwater aquarium. You may also add grazing snails such as Turbo, Astraea, and Trochus.

How do you clear a cloudy saltwater tank? ›

The solution is simple: do nothing. Don't add a UV sterilizer or do lots of water changes to remove the haziness; this just makes the bacterial bloom last even longer. Instead, wait one to two weeks, and the water will gradually clear up on its own as the bacteria reestablishes itself again.

What is the best water change for reef tank? ›

A 10% weekly water change is the best schedule, for a 40 gallon tank that means removing 5 gallons of water into a bucket and replacing it with 5 gallons of clean saltwater. Alternatively, you can choose a 20% water change every other week which would require two 5 gallon buckets or 10 gallons total.

What is the best water for a saltwater tank? ›

The pH shouldn't be too high or low, and it should remain constant. Different fish species may prefer different pH levels — most freshwater fish do best at a pH between 6.5 and 8.5. Saltwater species may require a more alkaline pH, since the average pH of ocean water is about 8.1.

Can I use bottled water for my saltwater aquarium? ›

Bottled Water for Saltwater Aquariums

As for saltwater and reef tanks, the only bottled water that can be treated would have to have gone through the reverse osmosis process.

What color algae is good for saltwater tank? ›

Coralline Algae is a type of red Algae in the order Corallinales. It is a desirable algae to have in a saltwater aquarium and its growth is an indication of a properly matured marine fish tank.

What eats bubble algae in saltwater tank? ›

Q: What eats bubble algae? A: There are certain fish species that eat bubble algae, including blennies, tangs, angelfish, and surgeonfish. Also, some invertebrates, such as emerald crabs, sea urchins, and turbo snails, will graze on bubble algae.

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