But, if you think it is irritating your zoas... I would remove it. I only have issues with the more photosynthetic sponges.
I did my weekly water change… I see no difference in my water quality between my fresh saltwater and my old water.. maybe I don’t have enough organics in my tank. My Duncan is ticked off by somethingIt shouldn't. It will go away though. I cant even recall the name. It kind of behaves like coralline algae. No harm like red tide and dinoflags.