What is growing on this frag?

A while back I spent way to much on this single polyp zoa frag, but i loved the colors! anyways this stuff started growing on the frag plug and is messing up the zoa. can anyone ID it?

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Thanks guys! At least its contained to the frag plug. I read it tends to crop up in areas of high ditrus accumulation. Makes sense, it started about a month after being moved to the sand bed.
 
You can hand prune it, or raise your magnesium with Kent Marine Tech-M if it becomes a problem. It has to be that particular additive, not just any Mag supplement.
 
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