So I woke up this morning and my fish were at the top of the tank. I quickly checked my equipment and think i found the problem. I have a HOB
overflow and I don't think it is working. By this I mean there is no water coming out of the other end of the tube for the wet/dry filter and the water level in my sump is low while the water level in my tank is high and the water at the surface is not moving at all, which leads me to believe there is no circulation in the tank and the fish aren't getting air. Is there any sites that show how to work on them or anything? Could it just be a clog? I have never had a problem with this before, any help is very appreciated.