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an invasive octocoral - each polyp has 8 limbs branching off in a radially symmetric pattern.
I'd suggest treating it like invasive clove polyps.
They're an invasive octocoral (soft coral) - some that can look like this include Clove Polyps, Sympodium, Sarcothelia, or Anthelia (I don't know how to tell them apart at this point, unfortunately).
The only solutions I've heard for blue clove polyps aren't reef safe (they might kill off other things in the tank), but the most common treatment I've heard is Fenbendazole. Someone else used Lugol's Iodine, but they also lost some corals from that. Some people say kalk paste or super glue may work, but I haven't seen many people reporting success with it. The links below may help:
Invasive purple clove polyps
Does anyone know how to kill off invasive clove polyps? They’re starting to spread and envelop my acans and I don’t want them swallowing my garden.www.reef2reef.comNot sure how to help with removing the mushrooms and palys though.Eliminating Blue Clove Polyps with Fenbendazole
A few years ago, I purchased a rock that had some beautiful Space Monster zoas on it. It also had some Blue Clove Polyp on it as well. I saw the BCP, I knew it was there, I really didn't worry about it at all because I had no idea what it could become. Fast forward....its now everywhere. Its...www.reef2reef.com
Edit: Oh, and welcome to Reef2Reef!
I can't find the post, but I recently read someone saying they had a particularly invasive brown strain of clove polyps that survived the fenbendazole treatment too.