As part of my tank-reboot, I have been considering adding UV. I know it is not magic for a reef tank, but it can help. Primary reasons: 1) Keep the water clear. I ran UV on fresh water long ago, and it was amazing for clearing up the water. Carbon can do similar of course. 2) Reduce film algae It kills free-floating algae, slowing spread to front glass, etc. So in theory, reduces maintenance. 3) Reduce bacterial problems. Less likelihood of Dinos and Cyano. Which is an issue since I carbon dose. I don't really consider UV effective against ich or other parasites. But debatable. Not cheap, since I need a decent sized one. Will kill a few beneficial pods, bacteria, and so on. But so do skimmers and pumps. Power use is really not an issue, since almost all energy ends up heating water, reducing heater use. Other opinions?? Good/Bad/Waste of money. Anyone have a good used one in the 50-80W range?