Too much CO2
I started pressurized C02 a couple weeks ago. So far the plants look great. I have been "eyeing" the bubbles because I have no counter and no drop check.
Today I noticed my fish were all swimming at the surface which they never do. Do you think I am over doing the CO2? They dont appear to be gasping and are not sluggish.
I turned it off and put an airstone in. In case that would help