I know...I do it more for my benefit than the fish
but I try to minimize surface agitation to maximize the amount of CO2 that stays in the water when the lights are on
I used to think like that, but when I started to let the water return ripple the surface I saw a huge improvment in my fish and a few plants.
A wise man once told me, if you look at a river that has plants and stuff growing, the water isnt calm. There is always a current. If it works for them..then it should definitly work for us. Also water current is free compared to making a unit for a 02 reactor. Or just get a wet/dry sump