Ya I keep mine on for 8hrs in a day. I figured it was getting around the time to change them. I'm just trying to figure out how that hammer coral literally disentigrated that fast! I had one head dye off on it from a crab picking at it but it took weeks. This literally happened in a matter of 3-4 days. That was the very first coral I got.
How about a nem how fast will it kill a coral? It has been fairly close to the hammer for months with no ill effect. When I downsized my ph it move a bit closer so I wonder if that did it. Very frustrating.