I just bought two Tiger Barbs today and all they do is swim in one place looking down. When they stop swimming the go straight to the top of the tank. Then they swim down again. I looked in my fish book and to me it seems that the have a swim bladder disorder. The water temp is 77 degrees. Other then that im not sure what will cause this to happen or how to fix it. Sometimes they just hang at the bottom of the tank looking down too not really moving. Can anyone help me please.