One of my flower horns just went mysteriously after being fine this morning. He was about 4" long and was in his own 20 gallon tank. When I fed his this morning he seemed fine and ate his found, however when I went to feed the fish today, I saw him lying down on his side( like a flounder) so I immediately got out a bucket, filled it with warm water, salt, maracide, maracyn plus, and a sponge filter and then moved him over. After 1 hour I check up on him and he was gone. What I'm trying to figure out is what exactly happened. Disease? infection? swim bladder?