Gonna flip here this week,I’m trying to keep stretching to a minimum so I will flip lights over 10-12 days slowly decreasing on/off time. Looking fabulous! My res is a 24 gallon circulating for best dissolved oxygen in system. Clean and change every 5-6 days. I’m adding Heisenberg Tea weekly to res & mediums for best beneficial microbes. I make Tea every 12-14 days, very simple. The dimmer switch on the SF 4000 really does make a difference.