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NFC: Blue Green Crud



One of my tanks has developed a blue green crud in it. It's not algea,
at least none that I am familiar with. I covers the rocks and such in a
layer. I vacumn it out but it's back seemingly within hours. Does anyone
know what this is and how I get rid of it? My Pleco won't touch it. It's
not causing a problem excpet for appearances, but I don't want it in my
tank..

TIA!

Ty


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