Please help ID volunteer branching algae..?

ShrimpBandit

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This white branching algae (almost helpfully displayed on the old frag plug) has popped up in my tank in a few places. I wasn't too concerned about it at first, but it seems to be irritating my zoas and ricordea. None of my CUC seem interested in eating it.

Any idea what it is? TIA.
 
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ShrimpBandit

ShrimpBandit

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Thanks. I'm looking for more info about bryozoans, but haven't found much that looks like what I have. Are they relatively benign? Any cause for concern?
 
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