Crayfish Tank Companions
Can anything live with a crayfish? Yes, if you pick fast, smart, and surface-dwelling.
Keeping Multiple Crayfish
Want more crayfish instead of fish? Read this first.
The Golden Rule
A crayfish is an opportunist, not a hunter. It can't chase down a healthy fish in open water, but it will absolutely grab anything slow, sleeping near the bottom, or already weakened.
So the rule is simple: choose tankmates that are fast, alert, and spend their time in the upper half of the tank. Avoid anything slow, bottom-dwelling, long-finned, or expensive enough that losing it would hurt.
Companions That Work
Fast schooling fish: zebra danios, white cloud minnows, and rosy red minnows are quick, hardy, and stay high in the water column.
Active barbs and tetras: tiger barbs and larger tetras are alert enough to stay clear of claws.
Fast livebearers: adult mollies and swordtails generally do well; their fry, however, will become snacks.
Pond and ramshorn snails: cheap, useful algae eaters. Some get eaten, think of them as a self-replenishing cleanup crew and occasional calcium-rich treat.
Skip These
Bottom dwellers: corydoras, plecos, loaches, and other catfish live exactly where the crayfish hunts. It rarely ends well.
Slow or long-finned fish: bettas, fancy guppies, and angelfish are too slow, and trailing fins are an easy grab.
Shrimp: cherry shrimp and amanos are premium crayfish food. Don't mix them unless you intend them as live feed.
Large aggressive fish: big cichlids flip the danger around, a molting crayfish is defenseless against an oscar or jack dempsey.
Other crayfish species: mixing species or wildly different sizes invites fights. See our multi-crayfish guide for what does work.
More Guides
Start with the star of the tank
Captive-bred color crayfish, guaranteed live on arrival.