How short of a photoperiod can I get away with?
I'm using the Fluval 13w clip-on light with my Fluval Spec. I'm trying to avoid using CO2 on this tank, so how short of a photoperiod can I go without doing more harm than good to avoid algae problems? I'm trying to get the tank to a point where it has minimal algae issues without nerites/other snails. It's currently at 6 hours a day, but I was wondering if I could go lower.