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Flourite going anaerobic

> I haven't found flourite to ever go anaerobic. Has anyone else on the APD
found it to go anaerobic?
    For what it's worth, I pulled up a big Val recently and it's lowest
roots were black.  Isn't that supposed to be a sign of roots growing in an
anaerobic medium?  In any case, the Val was growing in 3" of pure Flourite
in an area at the back of the tank that hadn't been disturbed for a long
time. -- Sherman Lovell