Coralline algae or caused by red flatworms ?

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Rmckoy

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Curious if red flatworms cause reddish circles in the glass ( eggs )
Or is this coralline algae ?
C3EA18BF-BAFB-4380-AF05-D8322520D401.jpeg
 
Agreed, probably coralline algae, but I'd check by running my tank scraper across it. Coralline will take a few scrapes to remove.
 
I was assuming coralline , it’s a new tank but older established system .
Currently battling the plague of flat worms
 

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