I have had two angel fish for around two years and everything has been fine up until about a week ago. I noticed that one of them was on it's side floating at the surface, I thought she was a gonna, but when I observed at feeding time I noticed she was still eating. Im pretty sure its a swim bladder problem but just wanted some advice from some more experienced hobbyist. My water conditions are immaculate as I do two water changes per week and all other fish are in perfect condition. Any ideas or suggestion would be very much appreciated.