Everything in my 220 gallon sps tank somehow seems to take on a green tint in one form or another after a while. Even the pink table I bought from Bill is getting green highlights. The blue/grey coral I bought from Dirk is getting some green, Etc.Etc. I have 3-400 watt Metal Halides and 2-6' VHO actinic over the tank. The bulbs I run are 10,000k on the ends and 20,000k in the center. The ends are E-ballast and the center is a PFO. Does anyone else seem to have a similar experience? A bonus is my light blue corals sometimes darken/deepen in color. Most brown corals I put in eventually turn green. This has happened seven times to my brown corals (green is better than brown anyway). I leave the VHO actincs on for about 17 hours and the rest for 8-10. I think it might have something to do with the extended time the actinics are left on in conjunction with the intensity of the halides.