Does anyone know why my corals lose color or go a little pale? They look great at first and after 2-3 weeks in my tank or so the color starts to fade and look dull. Doesnt look like bleaching. I use red sea blue bucket, alk is 8 sg 1.24 ph 8.3 I have a XR30 and a XR15 over a 50gal running at 50%, change 5 gal a week and i dont dose anything because i dont have that many corals. Any suggestions? Thanks