Hi Ethos, where did you add him to? They are not really suitable to go in with fish as they tend to eat or be eaten (depending on size of fish and cray) What sort of cray fish have you got? There are a number of different species of "blue lobsters" or cray fish. If you aren't sure what sort you it is, have a look on this website
http/www.shrimpcrabsandcrayfish.co.uk/Sh...a.htm~mainFrame
hopefully you will be able to tell what sort, there is also loads of useful info on there.
Just briefly crays are omnivors and need a mixture of meat and vegetables, mine loves peas, carrots, fish, mussels, cockles, etc, (hates sprouts
). They need plenty of hiding places, especially when in with other crays or fish - when they moult they are very vunerable. depending on type of cray is the temp. it needs to be kept at.
If it is in with small fish you need to understand that fish is food and they are able to catch and kill fish; it is natural. Crays are gorgeous animals which are fun to watch and I still thoroughly enjoy watching mine feed and muck about - he loves pulling the filter about - he also make the tank exactly as he wants it, all bits of wood moved, any plants ripped out etc. beautiful, fun and destructive. enjoy.