Star Polyp Color
Over the past 2 months or so my green star polyps have turned from green to brown. They also dont come out as much as they used to. Most of my water paramaters check out ok (phosphates 0, nitrates 0, ammonia 0, SG 1.021). I did recently start dosing my tank with kalk, other than that I can't think of anything else that has changed with the chemestry, I have moved the rockwork but they are at roughly the same height as they were before. I alternate spot feeding them with oysterfeast and phytoplankton. Anyone have any idea why they lost their color?