It has been in my tank since late November. I have in my tank a moon brain, 2 duncans, a ric, and had zoas that I traded to a friend. They are all doing well. My new additions came in last week which added a bubble coral, various polyps, a german blue polyp, and an orange capricornis. They were supposed to all be going under new lights, a blue plus, aquablue special, fiji purple, and a coral plus...but I ordered 36 watt going off of the 31 watt doesn't exist concept... I'm starting researching a new fixture that will house the 39 watts that I have sitting in my living room that I can't use. It would be nice to use my blue +, aquablue special, fiji purple, and coral plus since they are great bulbs and I am unsure if I would even want to try to return them. Input on fixtures would be great at this point...might upgrade to a 6 bulb unit? The fixture having moonlighting on it would be great...if not needed. Not only gotten quite used to it, but most of my time at home revolves around lights being off currently.