i found a good sized crayfish today and put him in my 55g aquarium, after several hours he still just ignores the fish and runs laps around the tank and acts like he wants out, does this mean anything specifically other than he wants out or will he calm down, will it eat freeze dried krull shrimp, so far it ignores everything and runs laps, what else around the house could i feed it, just dont say vegies cuz i dont keep those