wetone
Member
I have a rock covered in zoanthid polyps. They were open and thriving for a few months, abot 30 days ago they closed and only some of them open fully. The rest have a white powder look around the edges, almost like your face after eating white powdered donuts !!! There is also some slime. The water params are all fine, I have 2 250w 6500k MH and 2 110w VHO actinics in a 70G. The lights are about 12 months old and previous posts have recommended changing them now. Any thoughts as to why these polyps would start to close? can it be the lights? I have dipped the rock in Tech D conditioning dip twice this week (6 mins in 1 qt tank water, 48 hrs apart per LFS)
