Ok so Im changing my 120 FOWLR into a reef tank getting used T-5 fixture from a friend. Im pretty excited. Back to topic and question I have. Is it really bad to run a UV sterilizer on a reef tank? I have heard pros and cons. My friend has run one for 2 years now and loves it. I dont have one running now but I have slight algae problem. Nitrates and Phosphates are low but I seem to get algae growing on glass and mostly the overflow boxes. I had bought a couple more turbo snails which have taken a big dent out of it but it continues to grow even after like 3 months. No like I said it isnt bad but I would love to clean it up a bit and be more like the pictures of everyones tank on here. I know UV sterilizers kill all bacteria including the good stuff but how much good bacteria is really just floating in the water column? I thought most of it was in the substrate and live rock. I have a bare bottom tank so i don't have the substrate but I have live rock. So it comes down to is it bad to run a UV sterilizer on a reef tank?