I have three tangs, two damsels, two percs, a bangi, and a pink square anthias. Typical inverts, hermits, a couple of bumble bees, nasau snails, and thousands of astrea (spelling?) star fish, along with a couple of serpent stars, and a formia. All in a 150 x high.
I cannot post pics at this point, and my camera is not good enough to shown the detail. I beleive it is the formerians that are causing the issue. I have not noticed a loss of the zoos, but they are irritaed, closing up, and smaller than usual.
The only noticable difference in this colony is the small "weblike" growth coming from the base of the zoa's almost like a sea fan, and I have noticed these all over the tank. It is not vermatid or spiroboid (spelling?), that is another issue under control. Again, I think a dip would help greatly, but I cannot find the typical instructions to do so. I see plenty of links, but I am scared to just stick these in fresh water without knowing the process.