Surface algae
Film algae and young growth on glass and rock. Trochus, turbo, Astraea, nerite snails, and some urchins may fit.
Beginner livestock guide
How to Build a Saltwater Aquarium Cleanup Crew
A saltwater aquarium cleanup crew can help with algae, leftover food, and detritus—but it is not a janitorial package. Start with the job your tank actually needs, then add only the animals your aquarium can feed.
The short answer
Buy for the job—not the gallon count
I build a saltwater aquarium cleanup crew around a few animals with real jobs—not a large “cleaner package” that may slowly starve. Ask what each animal will eat, whether that food is present, and what you will do when it runs out.
Affiliate disclosure: This guide contains affiliate links. If you purchase through one of them, My First Fish Tank may earn a commission at no additional cost to you. The recommendations are still based on what fits the animal and the aquarium.
A cleanup crew does not export nutrients. It grazes, scavenges, and moves material around. You still remove nutrients with maintenance, water changes, filtration, and algae harvesting.
What a cleanup crew actually cleans
Four jobs—not one generic job
The original version of this guide separated these jobs for a reason: the animal that grazes glass is not necessarily the animal that finds meaty food in a sandbed.
Leftover food
Meaty food in sand and crevices. Nassarius snails, shrimp, hermits, and selected brittle stars may scavenge it.
Sand and crevices
Cerith and Nassarius snails, conchs, and some brittle stars use different parts of the bottom.
A specific outbreak
Bubble algae, turf algae, or heavy rock growth may justify a more specialized crab, snail, or urchin—with no guarantee.
Before adding anything
Is your aquarium ready to feed a cleanup crew?
Cycling is only the first gate. A perfectly clean new aquarium is usually a terrible home for ten hungry snails.
Ready to evaluate a candidate
- The nitrogen cycle is complete and salinity and temperature are stable.
- You can identify the material or algae you want managed.
- The animal’s food is present often enough to support it.
- Your substrate, rockwork, pumps, and tankmates fit the candidate.
- You have a plan to feed or rehome it if the job disappears.
Wait and solve this first
- The aquarium is still cycling or parameters are moving around.
- The tank is spotless and natural food is scarce.
- You are buying a package without knowing what each animal eats.
- The “problem” has not been identified.
- A fish, crab, pump intake, or unstable rock structure creates a clear risk.
How I choose
How I choose a saltwater aquarium cleanup crew
Tank size, bioload, substrate, and the actual nuisance algae determine which animals fit.
1. Aquarium size
A tiny tank runs out of food quickly. Adult size also matters: a conch or urchin may make sense in a larger aquarium and no sense in a small nano.
2. Bioload
More fish and more feeding can create more leftovers, but no cleanup animal makes overfeeding harmless.
3. Substrate
Sand-dwelling animals need the correct depth, area, and food. Bare-bottom tanks need a different plan.
4. The actual algae
Do not buy “an algae eater” before identifying the algae. Then fix the light, nutrient, flow, or maintenance issue that helped it grow.
Watch the original walkthrough
Start with the cleanup crew basics
This video pairs with the article’s core idea: learn what each animal actually does before building the crew.
See the Animal GuideThe animals
The best cleanup crew members—and their limits
This keeps the original guide’s broader animal list while making the decision easier to scan. These are categories, not instructions to buy one of everything.
1. Algae-eating snails
Trochus snails are one of my all-time favorites for film and fine algae. Turbo snails are stronger grazers but can bulldoze loose frags and run out of food. Astraea and nerite snails can also be useful after you check species-specific needs.
Best first move: start with a small number matched to visible algae, then watch whether the food supply keeps up.
2. Scavenging and sand snails
Nassarius snails are scavengers, not algae eaters. They are useful when meaty food reaches an appropriate sandbed. Cerith snails are smaller mixed-role animals that work in crevices, on surfaces, and in some sand.
A snail living in sand does not mean it “cleans the sand” or fits every sandbed.
3. Crabs
Hermit and emerald crabs are popular because they are opportunistic. That is also the drawback: they do not always limit themselves to the job you assigned. Hermits need spare shells and may compete with snails. Emerald crabs may help with bubble algae, but they are not a guaranteed treatment.
I find hermits easier to remove if one becomes a problem around coral.
4. Shrimp
Peppermint, cleaner, and fire shrimp can be fun aquarium animals that also scavenge meaty food. I would choose a shrimp because I want to keep that shrimp—not because I expect it to solve nutrient control.
Confirm species identity and watch food competition and coral interactions.
5. Conchs
Conchs can graze across an appropriate sand surface. The two questions are adult size and long-term food. A small, clean nano aquarium may not provide enough room or graze even when a seller’s tank-size label looks generous.
Use only when the sand area and visible food can support the exact species.
6. Starfish and brittle stars
Selected brittle or serpent stars can be useful crevice scavengers, but adult size and diet vary dramatically. Sand-sifting stars are not a default beginner shortcut: they can deplete the sandbed food web and slowly starve.
This is a species-specific decision, not a generic cleanup-crew purchase.
7. Urchins
Tuxedo and other suitable urchins can be powerful rock grazers. They can also eat coralline algae, run out of food, and carry loose objects around the tank. Secure the aquascape and coral frags first.
A strong grazer is useful only when the aquarium has a strong enough job for it.
8. Sea cucumbers and sea apples
These animals have highly species-specific feeding and safety needs. Some process substrate; others filter-feed. They are not generic tank cleaners, and sea apples especially are not beginner cleanup animals.
Advanced choice: research the exact species, feeding method, pump risk, and response to stress.
Four candidates I would consider first
These are examples, not a package. I am not recommending that you buy all four.
Trochus snail
My favorite first comparison for grazing film and fine algae on hard surfaces.
View Trochus Snails at BRSCerith snail
A smaller mixed-role candidate for crevices, surfaces, and some sand activity.
View Cerith Snails at BRSPeppermint shrimp
Choose it as an animal you want to keep, with scavenging as a secondary benefit.
View Peppermint Shrimp at BRSTuxedo urchin
A strong grazer only after food, adult size, and secure-rock questions are solved.
View Tuxedo Urchins at BRSA larger-tank example
Watch how the job changes with aquarium size
This 70-gallon example is not a recipe for a nano tank. It shows why surface area, food, and the actual cleanup jobs matter more than a universal animals-per-gallon rule.
My five-step decision
Keep the cleanup crew simple
A saltwater aquarium cleanup crew works best when every animal has enough food and a specific reason to be there.
- Wait until the aquarium is cycled and stable.
- Name the exact job: film algae, leftover food, sand activity, or a specialized problem.
- Choose one candidate whose diet, adult size, habitat, and tankmate risks fit.
- Start small and watch the food supply. Do not build the final crew on day one.
- Fix the cause and keep maintaining the aquarium. Add more animals only when a new, sustained job appears.
Continue from here
Use the right guide for the next decision
Identify Nuisance Algae
Choose Live Sand
Build a Water-Change Routine
Source review: Updated August 2026. Animal care is species-specific; verify the exact species, adult size, diet, and seller guidance before purchase.