I have had three black moors die in the last year, they seem to be having problems with their air bladder-swim bladder???? They tend to end up floating on their sides at the top of the tank, then I wake up to them laying on the bottom of the tank. I was wondering if this is more common in black moors, or if other fancy goldfish are prone to it. I really don't want to buy any more fish just to watch them die:frown:. Any input would be appreciated.