4-5 inch long crayfish! They’ll need a 20 gallon tank, minimum!!!! EACH!!!!! They should be in a single species tank or with fast moving, small fish only. Cichlids will eat them!!!! As they grow they’ll be able to pull down and kill slow moving, long finned fish, so don’t keep them with bettas or goldfish!! They like fast moving water, and lots of places to hide. You may have to add calcium to the water as well. They are super entertaining and very active! And a super bright and colorful addition to your tank! They’ll eat crustacean sinking pellets and tropical bites. They’re wonderful scavengers and will keep the bottom of your tank clean. Make sure to feed them as they commonly die from being under fed. Live electric blue crayfish Crawfish Crawdad Freshwater Lobster Live Fish