Ok, I have a question! :devil: I have NEVER run an air pump on any of my tanks. Yesterday, my brother in law was over and told me "you HAVE to have an air pump", so I went and bought one. I put it in the big tank, with the "big boys". Every since then, I have had fish floating on their sides, on the top, etc. Very unusual behaviour for my fish. I took the air pump out, and within 10 minutes, they were back to their usual selves again. Any input???