I have lost fish to redclaw crabs in the past, namely a pair of cockatoo dwarf cichlids and 3 golden barbs which we were assured would be too fast for the crabs to eat by the lfs in our newbie days.
Golden rule is if it has claws then it doesnt go in with fish.
As for crayfish i dare anyone to come and place their favourite fish with the redclaw cray in my fish room, fast and mean dont do the animal justice.
indeed i hear these problems, from time to time. and indeed its how i thought of both Cray's and Crab's. though having, done more research, i find, keeping them in a community, is not, as unusual as i at first thought. indeed poly (something) is now the way large numbers of fish,Cray and crabs are farmed, the poly thing means that many different types of stock, are farmed in the same pens,
i know of at least one Cray i wouldn't let within a mile of a community tank.
in the end i can only speak for my own experience!!! and that is, if your Cray is mature enough, providing its been kept in a Cray only tank, you have a fair chance, after introduction to a community, that you will have a happy group.
again for crabs, in my experience, not much i know, given dry area a brackish pool, and as with the Cray, keeping well fed. has lead to a happy group.
lol my Cray and Crab have had words, but the Crab seems to have a vertical take off system, way too fast for the Cray.
