Hey guys my first post I am wondering if I could keep a feeder crayfish(as a pet) with a small rainbow shark a medium sized bristle nose catfish a small albino Cory Dora and a ballon molly(my little sisters)
No, I'm afraid crayfish and 'proper' fish don't go together.
Crayfish eat fish and will, sooner or later, start attacking the fish. Also, corydoras catfish are very social, and should always be kept in groups of at least six, of their own species, so you need to look at getting more of them, assuming your tank is big enough