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Re: Dark Substrate

gary l meyers wrote:
> Onyx is pretty inert - about as active as diamonds.
> makes a pretty gravel for well planted tank and Cardinal Tetras !!

This was what I meant about being careful to know what you use. The 
mineral onyx (a form of quartz) is chemically inert as all get out.

The substrate material marketed under the trade name "Onyx" is not 
silicon dioxide, and may give folks with soft water serious problems 
with holding tds and hardness constant. It is a low-fired clay, 
material, I think. It may contain significant amounts of Ca and Mg plus 
their carbonates, which can change your water hardness a lot.

Caveat emptor, I think, is the correct expression. :-)


Wright Huntley -- 209 521-0557 -- 731 Loletta Ave, Modesto CA 95351

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