OK, so iv had the air pump off for a small period of time(24ish hrs). I have just noticed my 10 convicts, BGK, 3 silver dollars and oscar at the surface of the water looking like they are trying to eat/get air. They are all next to each other. I have turned the air pump back on to see if they stop it.
What could be causing them to do this? I only notice it when the air pump is off.