Can lack of clean water/tank cause this disease? Due to sheer laziness, I haven't cleaned my tank in two months, and just now I've noticed that one of my three goldfish has definitely got it. He's doing weird spirals and swimming upside down and sometimes just floating in weird positions. I have now cleaned the tank, and plan to do a more thorough cleaning this weekend, but yeah, just wondering. Also, if you can tell me anything else about the causes of Swim Bladder Disease, that'd be very helpful. P.S. if anyone asks, my goldfish are just those little cheep 26 cent ones you can get at petsmart. I'm not familiar with the actual name of them.