So I have been running pressurized co2 for a few days now, the drop checker is green. My question is should I be running an airstone at night after the co2 and lights go out. My fish do not seem to be having a problem. Thought that if I ran the airstone it would off gas all the co2. I only have a little surface movement with my hob fliters. The tank is a 46 gallon bowfront.