White Spots on Zoos

[marblesojecki]

My zoos aren't doing so good. I've had several different kinds for quite a while and now they seem to be going down hill. They're closing up and, while doing so, they expose white spots on their stalks. What could this possibly be? Parasite, something eating them? I have no nitates or phosphates, calcium 450, hardness fine. I'd hate to lose my zoos. They're my favorite!!!!! Please help me!!!!!!!!!!!!
P.S. I'll try to get some pics up later.

[JxMetal]

I have no idea what this stuff is, but my zoos had it as well. I just did a couple water changes in a week and started keeping up with water changes and made sure there was no fighting between corals. (Xenia fisghting with a leather didn't help anything in the tank) I also started feeding a healthy diet of phyto and zooplankton.

After a couple weeks everything was back to normal.