Cleanup Crew
Pick the perfect Crew

Published 2017


Written by Dan

A cleanup crew or CUC as you will see it abbreviated a lot online, is a collection of creatures you can add to your aquarium that perform various beneficial functions.  They will assist in cleaning and maintaining optimum water quality.  But which ones do you need and what do they do?


Do I have to have a cleanup crew?

Like many things outside of water and salt, the answer is no.  A small contingent of people will even argue against them.  The general consensus though, is that a good well rounded and properly stocked cleanup crew is beneficial and should be utilized in a saltwater and especially a reef tanks.

These tanks don't have good crews

What is the benefit of having a cleanup crew?

There are five major benefits to having a cleanup crew.
  • They will sift through the sand stirring it up and eating all the crud that is growing in there or has settled beneath the substrate surface. This is a big help to helping maintain appropriate oxygen levels in your substrate.
  • They eat the Algae (Including Pest or Nuisance Algae) to help keep your tank looking pretty and reduce the elbow grease you have to use to keep it clean
  • They eat Detritus (Fish Poo) and left over food that will eventually break down into nitrate just to feed the algae
  • They eat unwanted critters that hitchhike into your tank in live rock and along with coral. We can be as good as we want to be at curing, dipping, and quarantining but if you keep tanks long enough; it is inevitable you will get some type of unwanted hitchhiker.  Having the right hunter on the team that likes to eat your type of pest will take care of that.
  • Finally, they are friggen awesome creatures to watch crawl around the tank!
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How big of a cleanup crew do I need?

This question really depends on your specific setup.  That said do not go by what the bulk critter packages recommend, and definitely think through most of the per gallon recommendations.  They just don’t make sense, especially for a new tank. If you have a three month old reef and drop in a bulk cleanup crew package you tank will look awesome for a couple weeks.  The critters you add will eat up all the things you don’t want in your tank, and eliminating their food source.  They will then begin to die off and sometime feed on each other.  As these little critters die they will decay and feed the algae you originally got them to get rid of.  Now you have more algae than you started with and less critters to clean it. Now for the per gallon myth.  First off the creatures are cleaning the surfaces in your tank not the water in most cases (filter feeders excluded).  So if you have very little live rock and sand you will need a much smaller cleanup crew than someone that has a tank full of it.  That said there isn’t really any better standard so just keep your setup in mind and size up or down if you feel your tank has more or less surface area than the typical tank of the same size. I also have to point out that the bigger your tank gets the more outlandish some of these per gallon ratios seem.  I can’t tell you how many places I have read 1 snail per gallon.  Well in my 180 gallon that is, yep 180 snails.  See where I am going with this. You do have to start somewhere though.  Whatever recommended total you go with, begin at about 1/3 of the recommendation and gradually introduce new livestock over time the same way you would fish.  Don’t shock your tank all at once.  This will also allow you to see how many you really need and your tank can sustain long term. I give my recommendation per species per gallon below. Save Save Save Save

What creatures should I have in my cleanup crew?

Diversity is key!  Mix it up, having a variety of creatures that perform different functions and at times overlap will aid in creating a better-rounded ecosystem in your tank.  A well rounded team will also expand the spectrum of what your crew cleans. Think about it this way, if all your maid had was a vacuum you would have some dirty windows after a while.  That would suck, so make sure you provide all the needed cleaning equipment.  The good and maybe even bad news is you have a ton to choose from. Also consider your habits and the other tank mates.  If you tend to feed heavily or have a large fish community you may want to lean more heavily on detritus eaters, some of which also eat algae; rather than having a heavy algae eating crew. Just remember the 5 things your crew should do and hire a wide selection. Save Save Save Save Save Save

Acclimating your Cleanup Crew

Invertebrates require extra care when acclimating, since they are more easily impacted by sudden water condition changes this process is extremely important for settling them into your tank.  Although a lot of these creatures are just a couple dollars some can get expensive and not something you want dying a days after being pot in the tank. A long drip acclimation is recommended.  I would actually recommend letting most inverts drip for about 2 hours. To perform a drip acclimation setup a bucket or bowl housing the cleaner in the water it came in but with enough room for a good bit of water to be added.  Take water from your tank and slowly drip it into the bucket.  This causes the water parameters in the bucket to gradually match the water in your tank.  Allow them to drip for a couple hours to be safe. There are several ways to drip water from one tank to the other.  You can purchase specialized drip hose clamps which have a clamp, which crimps down on a hose reducing the possible flow.  These are good to easily allow multiple drip speeds. If you don’t have one, a great DIY option is to tie a knot in one end of an air hose.  Place the other end in your tank and start a siphon.  You can tighten or loosen the knot to control your drip speed. When moving your cleaner to your tank, it is best to do so without fully removing it from the water.  Place the bag or bucket into the tank and allow the star to enter the tank w/out being exposed to air. Save Save Save Save Save Save Save

Common Cleanup Crew Members


Snails make up the bulk of the aquarium janitor crew.  Snails clean everything and can go just about everywhere in search of food.  They will climb the glass rocks and even get down into your sump over time.  I recommend to aim for about 1 per 10 gallons.  Start off at 1 per 30 and work your way to that though based on your rock work and feeding needs.  Know that not all Snails are created equal, snails like turbo and trochus are bigger and will eat more than a margarita.  The down side to a lot of species is once they are on their back they done for though.

Nassarius Snail

Nassarius Snails will glide around the team in search of food, spends most of its time burrowed in the sand with its antenna sticking out like a periscopes.  They are referred to as walking dead shrimp because of the way they come out of the ground when food is put in the tank.
  • Eats – Detritus and left over meaty food that falls to the substrate
  • Max Size – 1/2:”

Bumble Bee Snail

Bumble Bee snails have many benefits.  They are small and can get into places other snails can’t.  They like to burrow into the sand in search of food which helps to keep your sand bed from being stagnant, and they are carnivorous and will go after troublesome bristle worms but unfortunately will also feed on the beneficial bristle worms as well.
  • Eats – Detritus, meaty leftovers, nuisance worms, etc.
  • Max Size ½”

Cerith Snail

Cerith snails are a medium sized snail.  They are voracious eaters but do most of their moving around at night.  Some species are even known to burrow in the sand but will most likely stay on the rock and glass.
  • Eats – Detritus, un eaten food, and algae
  • Max Size 1 ½”

Margarita Snail

Aside from knowing how to have a great time, Margarita snails are a great source for seeding you tank with purple coralline algae.  I have never had gotten a batch of these and not had some of them showing patches of the stuff.  They will clean your rocks and glass but are not really good at turning standing up straight once they fall on their back, too many drinks I guess.  So if you notice them on their back help them out.
  • Eats – Algae, the standard green and brown filmy stuff we all get and even the hair algae that pops up from time to time
  • Max Size – 1”

Trochus Snail

Trouchus snails are a bigger snail when full grown but not rock moving big.  They will mow through your tank clearing out the algae.  These snails will also focus on cyanobacteria and diatoms giving them added usefulness in your crew.  Another great benefit that sets these guys apart is the fact that when knocked over they can normally right themselves saving their own life and your wallet.
  • Eats – Standard Algae, Diatoms, and Cyanobacteria
  • Max Size – 1” or slightly over

Astrea Turbo Snail

Great at cleaning your rockwork and they can also climb the glass.  Just make sure to keep an eye out, if this big boy falls on his back he isn’t getting up on his own.  They have one of the biggest appetites of the snail family though.  They will decimate algae but will skip the standard stuff if there is hair algae, cyanobacteria, or diatoms in site.  This makes them a sought after addition.
  • Eats – Standard Algae, Diatoms, and Cyanobacteria
  • Max Size – About 1”

Mexican Turbo Snail

Differing from their Astrea cousin in shell design and waters of origin they share in many of their other characteristics.  They are avid algae eaters including nuisance hair algae, etc.  They do like to push their way between rocks though in search of food and if the rock tumbles they are ok with it.  So make sure your rockwork is secure and best glued with these algae destroyers.
  • Eats – Algae, Hair Algae, other Nuisance Algae
  • Max Size – 2”
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Crabs come in a close second for most popular cleaner.  Crabs will go all over the sand and rockwork in search of food.  Some may even climb the first few inches of glass if there is enough algae to grab a hold too, but won’t really keep the glass clean.  These too should be somewhere in the ball park of 1 per 10 gallons.  Crabs primary focus will be cleaning up left over food and detritus followed closely by algae detail.

Blue Leg Hermit Crab

Identifiable by their name sake blue legs purtruding from their shell, these are a cool addition to your tank and interesting to see moving around.  They can grow to fill a 1 ½” shell and will go after your snails if there are not enough empties laying around from their current size to max size.  That said they are great at hair algae and detritus along with some forms of cyanobacteria and film algae.
  • Eats – Detritus, Hair Algae, Some cyanobacteria, film algae
  • Max Size – 1 ½” shell

Scarlet Reef Hermit Crab

The Scarlet or Red Leg Hermit is identifiable by their bright red legs and yellow face.  One of the more peaceful hermits these are great scavengers and will consume copious amounts of detritus.  They are also huge fans of the filamentous, slimy, and hairy algae.
  • Eats – Detritus, Hair Algae, Slime Algae, Filamentous
  • Max Size – 1 ½”

Dwarf Hermit Crab

There is typically a dwarf version of every hermit crab out there.  The primary difference between them and their larger cousins is just size.  Most have the same appetites as they larger versions but can get into smaller tighter places others can’t
  • Eats – Varies on specific species
  • Max Size – Up to 1”

Emerald Crab

Emerald Crabs take on your more traditional non-hermit shape.  The shell of these crabs has a green hue with some being brighter and more pronounced than others, but all will have hairy legs. These crabs are great scavengers but are most often added to the crew because in addition to their looks and standard stuff most crabs eat, emeralds are fans of bubble algae.
  • Eats – Bubble Algae, Detritus, Left over Misys lasagna,  and standard algae types
  • Max Size – 2 ½”

Halloween Hermit Crab

This festive addition is really cool because of its coloring.  The orange and red bands on its legs definitely show why it was given the name.  Although their color gives them the cool factor, their diet of cyanobacteria and hair algae in addition to the standard detritus/leftover mix gives them some versatility also.
  • Eats – cyanobacteria, hair algae, detritus, uneaten meaty fish food
  • Max Size – 1 ½”


When I refer to starfish for the cleanup crew I am probably not talking about the sea star / starfish that caught your eye at the local fish store, although many of those do a great job on the glass and rockwork.  The ones in your cleanup crew will come out to play from time to time but will spend more of their time hidden in those places you can’t clean without really tearing your aqua scape apart.  They are also going to require a more mature tank as their food source will often include many microorganisms that will cultivate in your tank over time.  Aim for 1 per 50 gallons again based on rock and sand volume and wait until around 9-13 months before introducing them to the tank.

Sand Sifting Sea Star

Color wise they are a good bit more muted than other sea stars they can be a big benefit especially if you have a big sand bed.  These guys will spend most of their time digging through your sand bed in search of food.  The amount of sand they will overturn for their size is amazing.  This also mean that they need a good bit of sand to sift through in hunt of food or they could starve and die.  Because of this a minimum of a 50 gallon tank with several inches of sand is recommended with at least two inches of sand for each one you add.  So if you only have a 90 gallon tank, just stick to one.
  • Eats – Detritus and left over foods will be its main diet in a well fed tank. If that dwindles though it will feed on small invertebrates including bivalves, shrimp, mollusks, and urchins.
  • Max Size – 1 foot

Brittle Starfish

Brittle Sea stars are the ultimate scavenger.  They tend to be nocturnal hiding under your rocks in the day and coming out to forage at night.  These come in a huge variety of colorations and hail from just about every part of the ocean that has a reef.  They won’t be seen often but are wicked cool to watch crawl around the tank when you do.
  • Eats – Detritus, left over food, microorganisms, zooplankton
  • Max Size – 10”

Serpent Sea Star

The Serpent star fish is generally a nocturnal creature by nature.  Over time they will often start to come out during the day at feeding time to scarf up any meaty food bits that hit the rock and substrate.  Their center mass is a 5 sided pentagon shape with an arm protruding from each corner.  They range in color of green, maroon, and orange with some having bands or other markings to identify their specific species.
  • Eats – Detritus and Meaty foods
  • Max Size – 1’ 2”
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Shrimp are awesome to look at and can server a few purposes.  Most will eat detritus but depending on the specific species, some will also clean fish, sift sand, or even eat unwanted hitchhikers like aptasia and bristleworms.

Peppermint Shrimp

Often kept for their keen appetite for Aiptasia, a small hitchhiker anemone, although some peppermint shrimp have been noticed to skip the Aiptasia when detritus fish food are available in abundance.  I guess every shrimp has their own taste buds just like humans.
  • Eats – Aiptasia, Detritus, Meaty foods
  • Max Size – 2”

Banded Coral Shrimp

Quickly identifieable by their banded stripes and large front leg pinchers, coral banded shrimp often find themselves taken home for their looks alone.  They are known to have a sweet spot for bristle worms and will hunt them down in an aquarium.  If not already in an aquarium these are generally quickly added if nuisance bristle worms are noticed.
  • Eats – Bristle Worms, Small Inverts, Detritus, Meaty Leftovers
  • Max Size – 3”

Pistol Shrimp

Pistol Shrimp often called Snapping Shrimp and Symbiosis Shrimp are beneficial because of their ability to churn through and aerate your sand bed.  They come in a variety of colors with the common being red or striped beige.  More expensive variations include blue and purple pinchers.  When kept in pairs one will keep watch while the other burrows a nest into the sand.  What is even more amazing is that if kept with Goby’s they will form a Symbiotic partnership where the Goby keeps watch and the near blind shrimp will keep their burrow dug out and clean.  The Shrimp will share their food with the Goby for this watching eye as well.
  • Eats – Algae, and any leftover food on the substrate and rockwork
  • Max Size – 2 ½”

Skunk Cleaner

The Skunk Cleaner fish is most commonly found with a yellow to brownish yellow underside and a bright red back and a single white strip running down the center of it.  Its long white antenna will typically stick out of the rocks giving away its location.  These shrimp will actually not hide too much.  They will rather stay out on the rockwork allowing fish to swim up and be cleaned by them like a fish wash.  The Scarlet Skunk Shrimp will actually eat the ectoparasites(like ich) and dead tissue off the fish.  In some cases they will even play dentist cleaning between the more trusting fish’s teeth.
  • Eats – Outside of what they get from cleaning your fish they will also eat some algae but will pull most of their diet from the meaty bits that get past your fish and make it to the bottom of the tank.
  • Max Size – 2”
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Urchins make for a cool addition to the marine tank.  Be careful with most species though.  Tuxedo Urchins excluded, most Urchins are known to bulldoze the tank.  Ensure a tank you put them in has the rock work secured and glued together where appropriate.  Urchins can and will topple unstable structures.  Given a safe home these guys will tear through algae though.

Tuxedo Urchin

Tuxedo Urchins come in two color variations the Blue Tuxedo and the Red Tuxedo.  Both have a similar blue center but the Red Tuxedo is adorned with red spines as opposed to the Blue Tuxedos Blue to Brown spines.  The tuxedo urchin is one of the smallest max size urchins there are and due to this typically keeps it from moving around any of the larger rockwork in your tank.  It does like to grab smaller objects and carry them on its back as camouflage though.
  • Eats – All types of Algae including Hair Algae and Coralline
  • Max Size – 3”

Pincushion Urchin

Pincushions come in colors ranging from blue, red, and purple.  As they move around the tank they will wedge themselves in to any and all crevices they can searching for food.  This is often why they will topple your aqua scape.
  • Eats – Algae
  • Max Size – 8”

Shortspine Urchin

Though its max size is the same as the Tuxedo Urchin it is more apt to topple rock piles.  This is due to its tendencies to burrow into the substrate at the rock base and that it will burrow small crevices into calcium based rock or dead coral can cause instability in the rock.
  • Eats – Algae
  • Max Size – 3”
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A well balanced tank is going to grow pods naturally.  They will get into your tank via live rock, substrate, or as coral hitchhikers.  These provide benefits not just in eating micro detritus and algae but also by becoming a food source for other creatures in your tank.  Some fish and inverts will feed on nothing but these in their natural habitat.


Amphipods are the larger of the two pods and are typically what most people notice in their tank.  They are about the size of flees and may even be mistaken as baby shrimp to the unknowing.
  • Eats – Algae and Detritus
  • Max Size – 5-10mm depending on species


Copepods are the smaller cousin to the Amphipods.  Most times if you see copepods you will have seen Amphipods and will just consider them to be babies of the larger.
  • Eats – Algae and Detritus
  • Max Size – 1-3mm depending on species
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Did I leave your favorite cleaner out? Let me know in the comments so I can consider adding it in future updates!


Do you need one no, should you have one yes!  Building a solid cleanup crew will be a tremendously beneficial step in setting up your tank.







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