On my tanks it ranges from 7-10 hours. I'm curious how many hours per day you guys leave your lights on for?
Do you think it would be reasonable to cut the photoperiod to only 8 hours, say from noon till 8pm, even if that increases the time there is (significant, my blinds are horrible) from 7-noon as opposed to just 7-9? Because I would *love* to do that, just always figured that would be bad for the tank.Seems to me that sunlight will seep through regardless of when your photo period starts or ends and you have to account for it regardless. I run all my tanks on timers, from either noon or 2pm till midnight. Most people have the free time in the evenings anyways.