Hi. I just reused a hamster named Humphrey and upgraded his cage to a 29-gallon fish tank. He is some sort of dwarf hamster and is still young. He has been pooping an awful lot on his wheel, and I was wondering if that is normal? He has been seen by a vet and is healthy, and this is just very puzzling to me. I am still trying to tame him and build trust, also. This is my first hamster, so any tips in general would be greatly appreciated.