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What is this?


lynn.reef.nerd

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If it comes up like a mat when you disturb the area, I’d also say cyano.  From my experience this is easier to get rid of than the red variety.

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If it's not present first thing in the morning but present again later on, I'd say it's cyanobacteria (which can be green to bluegreen or red/purple). Otherwise, it looks like green film algae to me.

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