I figured I'd add to this thread. When we first started the hobby we had all soft corals and I thought I got all the GSP and mushrooms off the rock before adding it to the 300 gal. sps tank. Anyway, I missed a few and they took off. About 40 lbs of rock got mushrooms or green star polyps growing on it, but I didn't have any sps on that same rock. I did have a RBTA on the same rock though.
A couple weeks ago our RBTA split and in doing so decided to travel all along the GSP. At first I didn't think anything of it, then I noticed that a really pretty purple sps turned completely brown and lost polyp extension. A few days later, one of my garf bonsai colonies started to STN from the base up. Then a few days after that, both my ora chips acro colonies started losing flesh on their tips and sliming and my oregon tort stopped polyping. Overnight, a becker tort frag and yellow tort frag started to lose the flesh on their tips.
We finally figured out that all of these corals were on the same side of the tank as the GSP and down wind from them. I think the anemones ticked the GSP off. All the corals, even the same species on the other end of the tank are unaffected. Anyway, we just spent a couple of hours removing all the rock with GSP or mushrooms and placed it in another tank.
I had cured LR in a 40 breeder that was going to be a sps/lps tank so it replaced the rock we removed from the 300.
I'd like to move some zoas to the 40 breeder that now houses the GSP, mushrooms and anemones and was curious if they would be affected by the toxins released by GSP? I wanted to break all the GSP and mushrooms off the rock, but just moving it all was a lot of work and Mike doesn't want to break all the big pieces of rock as they're really nice looking.