My son won two bettas (a red one and a white one) at a fair about a year ago. They share a tank and are separated by a divider. The red one has not been swimming or eating for a little more than a week. It simply sits in the artificial kelp. We removed the kelp to see if it would start swimming but now it has pressed itself against the divider, near the top of the tank and refuses to move. Moreover, the fish has doubled in size in the past week. It's much larger than the white fish. Although, it doesn't look bloated. It looks like the fish has seriously grown. It looks huge! I'm thinking it's sick and perhaps I should separate the white fish so it doesn't contract whatever the red fish has. If anybody has any guidance about what's going on, I would greatly appreciate it.