Problem

this stuff killed all my coral except my gsp and leathers

Be about it sorry to say ..... I myself was not told by the local fish store that neon green star polyps were aggressive like yours and they sold them to me knowing I was new to the hobby they also sold me pulsating zenas .. also aggressive .. that was awile back .. so as I watch it grow I seen how it was doing it .. so I removed it fast .... now I stay away from anything that I can't control. ..

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i hear ya just not sure if i want all that expense right now

thanx for your help

I have a potato chip coral that kills anything it touches. ..lol

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I hear ya on the money. . .. what size tank ?

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Red Clove Polyps. Is this them?
http://uploads.tapatalk-cdn.com/2016...f7cdc2f1cc.jpg

His look purple with white center from the pic

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Yeah just caught that. I had a rock of Lavender Star Polyps which I believe his are also. I'm sure there's other names but google pic come up with LSP.
http://uploads.tapatalk-cdn.com/2016...472e647c53.jpg

That looks like them

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If that was the only thing on the rocks, I would take them out and manually get the stuff off. Depending on what's in your tank, you could do it one or two rocks at a time over several weeks to minimize the disruption to the system.

As far as removal from the rock, I'd bet a propane torch and wire brush, followed up with a freshwater rinse might do a decent job.