hey again old friend
partyanimal, firstly good 2 hear from u. but b better under better circumstances. euthanasia is the best thing for this fish, as i used 2 hav this problem - i wont go into the details, but yes it leads 2 death. only, this death is a slow one. the problem lies within the swimbladder, it is possible that it has taken in too much air, and has overinflated it, or more likely the swimbladder has been damaged in some way or was deformed from birth leading to the problems you are experiancing in its later life. the most humane way of euthanasia is to hit the fish over the head with a hammer. do not leave them out of water, boil them, freeze or anything like that...anastetics are the best, but u hav 2 obtain them from a vet...cost and hassle is out of this world! alcochol acts as a slow anastetic, and prolongs the death, so i wouldnt recommend it. no point seperating the fish unless it falls 2 a disease due to its weakened resistance thru stress, as the swimbladder problem cannot be passed on, except possibly 2 offspring if it is a deformity. there is no way of treating this...hope this helps.