I got them yesterday and they all seem to be ok except one. This one is hiding in my decoration and won't come out at all. If I can convince him to come out he does swim a bit and looks ok and will eat although not as aggesively as the others do. My water parameters are all good no ammonia/nitrites etc. Should I leave him there and see what happens? Take him back to the store tomorrow morning if he hasn't changed? Thanks I don't want him to die.