On Sun, 26 Mar 2006 10:18:29 -0500, "J. Bahl"
wrote:

Using crushed coral as the substrate will also work.

I added a mesh bag with a half cup a week ago and today I am pleased
to see that tank has remained at exactly 7.0, which matches my tap
water. The GH and KH have increased some as well, though still in the
soft range. I'm giving myself a while to decide if I want to increase
the amount of crushed coral or hold tight and test again in a few
days. I'm not certain I would like adding it to my substrate until I
am absolutely sure of the amount I want.

-- Mister Gardener