Thanks for the info. Actually, the possibility that I simply have too much light has been nagging at me. I built some aluminum frames for the top of the tank and put fiberglass window screening in them. I think I'm going to install them and see what effect they have.<a href=showthread.php?s=&postid=15395098#post15395098 target=_blank>Originally posted</a> by Dejavu
... I ran 12k reeflux for nearly 4 years and never ahd a problem with them or UV. Currently I run 20k radiums and they actually have better par # than the 12K's.
I would guess that the lighting of your corals might be due to either to much light or lack of nutrients. Most of the fish you have are smaller and from the pic it seems little your system runs pretty clean. Just a thought.
Have you try turn off one of the lights for awhile and see if that makes any difference? I would think that you could get way with running just three bulb for awhile.