I completed my changeover a month ago from my 46ga to the 72ga bow. I kept approximately 50% of my original water. My problem is I have green water and algae builds up on the glass (thick green crust) everyday when my lights come on. I recently started my phosban reactor, made a 20ga water change. I think the bulbs may be too old, purchased a used 8 bulb Current Pro fixture T5- HO. Any clue? ??? I kept my sump filter w/ fugi, chaeto, LR rubble, protein skimmer, Vortech MP 20, 600gph return pump, 80 lbs LR in DT, 60lbs LS.