I have one question that just popped into my mind here: with the type of growth I get (as per last screen shot) would it be better to let screen grow over a longer period...say shift cleanings to every 10 or 14 days instead of every 7?
I upped the lighting from 12 to 18 hours on and 6 off...that was sunday night...I will check it tonight to see the growth on it...