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· Banned
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I'll tease you about that tachy gravel also:)
I typically associate this algae with two things: low CO2 and/or low PO4.

Double check CO2 if the PO4 is good.

Look, poor CO2 will get me if I'm not careful, so it's not something that folks ever stop having issues with, we get complacent and think it's something else. But just remind yourself to double check it.

Tom Barr
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