White spot

racoloish

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I was cleaning the glass and I notice some circular white spot, a lot of them. They don't go with the magnet. What are they, are they harmless?

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Reefing Madness

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Pileolaria. Harmless

spirorbis.jpg
 
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racoloish

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What they do and where can I find info on them(scientific name)?
 

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