I threw a meatball into my crayfish community aquarium. They seem to like it. I have three species in there: Cherax quadricarinatus (Australian Redclaw), Astacus astacus (European Noble Cray), and Astacus laptotodactylus (Turkish or Galician Crayfish). I bought Australian from a hoybbist, Eurpeans were self caught, and Galician narrow claweds were purchaced from a supermarket without realizing they were separate species.