Freshwater shrimp and snails: aquarium invertebrates guide

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Freshwater shrimp and snails: what this hub covers

Invertebrates have become one of the fastest-growing corners of the freshwater hobby. A colony of red cherry shrimp grazing on moss, a few amano shrimp picking at hair algae or a zebra nerite snail cleaning the glass all bring something fish cannot: a clean-up crew that works all day and a small, fascinating ecosystem in its own right.

This section covers the freshwater aquarium shrimp and snails most keepers in the US actually find in stores, with species guides, tank mate advice and an algae-control comparison. Every guide uses the same structure: origin, size, tank size in gallons and liters, water parameters, diet, breeding and common problems.

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Where to start: shrimp or snails?

If you want color and a colony that breeds on its own, start with cherry shrimp. They are hardy, cheap, breed in plain freshwater and thrive in tanks as small as 5 gallons. If your main goal is algae control, amano shrimp are the strongest algae eaters among common shrimp, though they will not reproduce in a home tank.

Snails are even easier. A nerite snail eats film algae on glass, rocks and leaves and cannot overrun your tank, because its eggs need brackish water to hatch. A mystery snail is larger, more active and very beginner-friendly, but it produces a lot of waste and lays visible egg clutches above the waterline. To compare all the options for algae, read our guide to the best snails for algae.

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Water and tank basics for invertebrates

Shrimp and snails are more sensitive to water chemistry than most community fish. They need a tank that has finished the nitrogen cycle, so cycle the tank first and wait a few extra weeks for biofilm to grow before adding shrimp. Check our aquarium water parameters guide to read your test results.

Hardness matters more than for most fish: snails need calcium (GH) to build their shells, and shrimp need minerals to molt properly. Very soft water leads to pitted shells and failed molts.

• Ammonia and nitrite at 0 ppm, nitrate ideally under 20 ppm
• Stable temperature: big daily swings stress molting shrimp
• No copper: many fish medications and some plant fertilizers contain it
• Drip-acclimate new shrimp over 1–2 hours instead of a quick float
• A sponge filter or a pre-filter sponge on the intake so baby shrimp are not sucked in

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Keeping invertebrates with fish

Almost any fish will eat a baby shrimp, and many will eat adults too. Small, peaceful fish such as otocinclus, ember tetras or celestial pearl danios are generally considered shrimp-safe, especially in a densely planted tank. Our guide to shrimp tank mates lists safe, risky and incompatible fish.

Snails are safer with fish, but loaches, puffers and some large cichlids eat them. A betta usually ignores nerite and mystery snails, while its reaction to cherry shrimp depends on the individual.

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Gear for a shrimp tank

A shrimp tank needs little equipment, but the right choices help. A gentle sponge filter is the classic option because it is safe for shrimplets and grows biofilm they graze on. A good water conditioner removes chlorine and chloramine, and a liquid aquarium test kit helps you catch ammonia or nitrite before shrimp start dying. Easy plants like java fern and mosses give cover and extra grazing surface.