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Re: life expectancy of Flourite

> Shouldn't a flourite substrate be
>sufficient (I set up the tank 7 or 8 months ago), or could it be depleted?

I just asked Greg at Seachem about this, on behalf of my own tank.  He said
that a pure Flourite substrate contains both macro and micro nutrients and
that these nutrients are released very slowly, as the roots need them.  He
also said that this substrate ought to be self sustaining for several years.