ok I have a question if all fishes died in the tank all I have left is two spider crabs one shrimp and colt corl can ick survive on them if there is no fish?
Ich is dependant on fish as a host. Inverts are unable to be infected...even though they can be carriers. Keeping them in quarantine (without fish) for 4-6 weeks should insure that the ick has been through it's life cycles and unable to reproduce.