my african dwarf frod died today, and i dont know why, its been feeding fine, and swimming around great. yesterday i hardly saw him, but sometimes dont, the bigger isnt so shy so i see her more anyway. then today he was floating on the top of he water, something he does sometimes any way, when i came back a few hours later he was dead, his skin was coming of like he was shedding his skin and his belly was all extended and swollen. can someone please tell me what this is so it dont happen to my other one.