Having a reversed photoperiod is usually no problem with a refugium under the main tank. Its dark, behind closed doors, and waiting for the sun to go down and then the lights come on when the main tank lights goes out. Thats the idea for a reversed photo period to keep our oxydation and ph balanced during a 24 h period . The macro algae produces oxygen during the night balancing out the production of co2 of your main tank . Now what if the refugium like mine is not under the main tank and is a display refugium in the same room . Now i still want to do a reverse photo period, but do you think i'll work. The room has 2 windows, which i'll dim down with blinds, to avoid the sun rays. And of course the light of the fuge wont be on during the day. Do you think the daylight will still be too strong for the fuge. Should i put a panel in front of the glass during the day, any thoughts on that???