how about one light on for the 8 hours and one light on for 2-3 hours around the middle of the period?I'm using an 8.5hr photoperiod. I have a bad habit of leaving the blinds open, and the morning hours allows a lot of sunlight to get through...nothing direct, but enough ambient light that the plants probably take advantage. I need to make sure I have the blinds shut completely, as I think that may be affecting things. That, on top of not having any fish! October can't come soon enough.
i halso have a 75 with three bulbs but i run some co2 and somewhat add ferts.