I've had these glofish for about two years now and I looked over at the tank after I fed them yesterday and saw that one was drastically inflated. He looks like a balloon. all the other fish are fine and my parameters are good to go but this dude is massive. I have three theories but idk if any of them are right. One is that he just ate almost all of the food and is over fed. two is that maybe it's a female and she's pregnant? The last is that maybe it's got a tumor. help me figure this one out.