Does anyone use these in their tanks? I know they're supposed to have a few benefits in an aquarium, but specifically I'm wondering whether they really DO help reduce algae in a tank. My mbuna tank is a 40 long, and the rocks in it go about halfway up the tank - so there isn't much space between the rocks and the LED light over them. As such, the brown algae builds up very quickly on the rocks, even though I make sure to keep lights on to a minimum - usually about 5 or so hours a day. I've tried fussing with other lights that aren't as strong, but they're just too dark and the fish get lost. As it is, I have about an 18" LED as the only light on a 48" in tank, and I've used black electrical tape to cover up half the lights on the fixture. I manually scrub the rocks every week with a water change, but it grows back so **** quickly lol. So I'm wondering if the claims that UV sterilizers help reduce algae have any merit or not?