I recently rescued a turquoise betta fish from wal-mart, because he had fin rot. He's been acting really wierd lately. I put fin rot medicine in his tank, I put water conditioner in, I change the water often, and his water is always at 75 degrees. But he darts around the tank, today, he wouldn't eat, and his stomach almost looks like it has ich on it. What's wrong with him?! I want him to have the happiest life possible, I'm even saving up to buy him a bigger tank! Please help!