hi all i just got a poly same one as before he is about 3 1/2 inches , and ive been noticing something strange about it he is eating fine but instead of dwelling at the bottom he is floating at the top of the tank he is swimming around like normal but do you think something is wrong with his swim bladder or getting some sort of infection or is this normal before for a poly this is the first one ive owned so not to sure on there behaviour any advice would be greatly appreciated thanks in advance