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Re: Flourite and anaerobic conditions

   There was no eruption of gas bubbles, nor was there any smell.  But the
>roots were definitely *black* -- and they didn't otherwise look like or feel
>like they were
>necrotic.  My wild guess was that the black color was from reduced iron (?
>way out of my depth here. ;)  It was a big red marble Val and very healthy.

Doesn't sound like anaerobic conditions then. It always has the stinky gas
(H2S) bubbles along with it. Not sure about the color. Plants tend to do
very poorly in this anaerobic gravel too. 
Tom Barr