I've searched and didn't find much info on this except possibly due to overfeeding, which I don't think is the case since its not even the most aggressive eater in the tank. So I have 5 glofish (1 of each color), 2 tiny cobra endler's guppies, a honey sunset gourami, a cherry barb, a bolivian ram cichlid, a green cory cat, a ghost shrimp, and a gold mystery snail in an 8 gallon aqueon evolve tank. I know it's a lot of fish for this size tank but I do weekly water changes and test the water often and everything stays within range. Ammonia, nitrites, and nitrates are all non-existent. pH is neutral and hardness and alkalinity are pretty high, with hardness around 200 and alkalinity at 180. Anyways about a few days ago I noticed my green glofish looking like it was getting bloated. I have seen it poop so I don't think its constipation. Over a period of about 3 days he/she grew exponentially and now it is so fat that its back is arching. It still eats and swims around fine. Doesn't seem to look sick. I don't think its dropsy since its scales don't seem to be protruding. Also from the information I've read I don't think its getting ready to lay some eggs since it didn't mention them getting so fat anywhere. I am clueless as to what this could be. Anyone on here have any helpful info? Any help would be appreciated. Here is one pic I was able to snap, I am in the process of uploading a video which should be clearer.