Here's my experience with them, a mushroom was one of my first "corals" I bought for my reef and after 15+ years of them growing and spreading, trying every thing for years to get rid of them, I shut down that tank and bought all new rock. They are a plague.
Good luck, IMO nothing gets rid of them, they just seem to spread harder and faster the more you try and kill them. I still have all the rock, just waiting until I have the desire to give it all a acid bath.
I still have a purple tang from that tank, he's been around for 15+- years.
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