Hey bubba, are you using gfo to bring your phosphate down? If so how are you doing it, very small amount in a bag?I agree that it could be either the phosphates or alk but it started to lose pink before I did the alk. No other coral lost color or that I noticed. I think a lot of the rainbow corals need low phosphates to bring out multiple colors IMO. As far as the alk I started to notice a few corals didn't like it. Their tips started to get that wrinkly look to them. I'm just going to go back to how thing were.