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AbjectMaelstroM

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This started popping up few weeks ago. Doesn't seem terribly aggressive, but definitely spreading (in the nook and crannies). Popping up like little cheapets.

Any ideas what type of algae this is and possible ways to deal with it? It doesn't seem to brush off very easily, isn't bothered by high flow, fairly short.

20210612_144210.jpg
 
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lapin

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Maybe

 

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