Well, mt brothers fish seems to have trouble swimming. He lays on the bottom, and if he swims it is with his head up and his tail down. He still eats, begs for food, and enjoys attention, so he isn't suffering. Is it SBD? My two males are acting weird, just laying on the floor of the tank. They still beg for food, and become very active when I feed them, but then go back to being lethargic. Why? Every fish (but my fish I got from a breeder) either recently died or isn't healthy.