Help ID please

tamzor

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bought some chaeto that had eventually melted away. And was left with this slowly growing in my sump. Is it good or bad?
719E94A4-93CB-4E82-A8A0-0560B1AC26F3.jpeg
 
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tamzor

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Here’s a piece I pulled off
 

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AlgaeBarn

Marine Aquariums Made Easy!
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It looks like byropsis. I would scrape it off and syphon behind behind as you are doing it. Has it only surfaced in your refugium?- Raven
 

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