This has been going on for weeks, now. About 2 weeks after I moved him from a bowl to a ten gallon, he started showing signs of constipation. I fasted him, he recovered. Then I added the cories. A week or so later, again with the constipation. Fasted him, fed him peas, saw him poop, all was well. I started to think it was the pellet food, but I'm been feeding him that since I got him almost two years ago, and its never had an adverse effect. I tried soaking the pellets beforehand - same thing, he is bloated the day after. I hardly even feed him anymore, mainly a grand total of two pellets every other day, followed by a fast or a pea if he's bloated. I don't see how it could be dropsy, the water is in great condition and I do weekly changes. When he's bloated, he shimmies along the top and fights to swim to the bottom. It's unsettling seeing him like this, what could be going on?