Last week I noticed my betta Kenji floating at the top of his tank and thought he was dead, so I tapped on the tank and he moved. I noticed he was extremely bloated. I put Kenji into a bowl, and the next afternoon he had passed a massive poop, and his bloating went down and he was a happy fish. I fasted Kenji for a day, fed him again and the same thing happened. I fasted him for another day, he once again passed a massive poop. I fed him over the next few days and he was fine. 3 nights ago I fed Kenji and Nemo, my other betta fish, and Kenji was bloated yet again. Although Nemo has never been bloated I decided to fast both of them for 2 days. After the 2 days I fed them both, and Kenji got bloated yet again. The next day he was back to normal size. He's not bloated now and I'm pretty sure it's not Dropsy because I had a betta fish die from Dropsy. UGH. I don't understand, Kenji and Nemo get fed the same amount of food. I crush up the food because they're still not big enough to eat a whole piece. Kenji has also been more frightened lately. I used to put my finger on his tank and he's flare up at it and follow it, now he darts and hides behind something. Nemo on the other hand still flares up at my finger. Sorry for the long detailed question.
Kenji and Nemo are in a heated tank. They are in the same tank, with a divider in the middle, it's not small but right now it's just a temporary tank until I get the supplies I need for my other much larger tank.