[AGA-Member] Re: AGA-Member Digest, Vol 13, Issue 12

["Robert H" <robertph3@comcast.net>]

> > "If the Substrate is the source of nutrition and it is not replenished, 
> > its performance can deteriorate."

I agree!<<

It depends on what you definition of nutrition is. If the substrate is 
artificially fortified with water soluable minerals or NPK, then yes it 
dimminishes. If it is a clay or laterite substrate it was never fertile to 
begin with. Clay and laterite substrates like Seachems Flourite or Onyx are 
not fertile. They contain only oxidized minerals. Amano does not disclose 
the exact mineral or nutrient content of any of his products. Oxidized 
minerals become water soluable from organic acids, and it does not matter if 
the substrate is a year old or ten years old...it will still have oxidized 
minerals.

Robert Hudson
www.aquabotanic.com

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