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About a week ago I noticed my male betta was round and swollen in the area under his gills -- he looks like he swallowed a marble and it's lodged in his chest. I have 2 other male bettas, and none of them have this problem, so I'm quite certain it's not the water. He does, however, eat different food (pellets) than my others since he doesn't like theirs (tropical flakes). He's having a bit of trouble swimming and he's a little wobbly. I've never seen anything like this in all my years of owning fish of any sort, and I can't find anything like it on the web. Does anyone know what could possibly be wrong with him?