Lighting

[ahowlett]

What is anyones opinion on 400 w 20k on a 90 gallon mixed sps reef I m having some bleaching issues and my coraline is going away I ve used these for over 1 1/2 years now it starts

 

[6Speed]

my coraline growth slowed a good bit when I went from t5's to 250w halides. with the t5's the coralline would grow like crazy everywhere. bleaching of corals could be from multiple causes so I would check all your chemistry, phosphates, etc. how high are the lights mounted? how high are the corals in the tank?