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What is this?


Broseff

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I don't have any coral, and my snails all had super clean shells (I didn't see any coralline). 

 

Can it really spread from super small amounts? 

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I would suspect that it would start at the microscope level so it is certainly plausible it came in unnoticed. If it is coralline it showing signs that your system is healthy. Again I’m not an expert by any means but it looks more like coralline then cyano to me 

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Quick test: blow on it with a turkey baster.  If it blows off the rock, it's probably cyano.  If it's stuck tight, probably coraline. 

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