Since I run the UV 24 hours a day, I thought it would keep the green water away. Would not want to know what the GW would be without it.
I only run my light for eight hours. Which seems like a short light time. The 45g this tank replaced did not have problems.
75g, pair of Blue Rams plus baby, 4 3"discus, 12ADF's, 96w 6700k-light 8hrs, No C02, Excel, EI dry macro's and micro's, Eheim 2126, 18w UV, 2 Nano 270 powerhead. wall of bubbles for more O2 for such a deep tank.