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Originally Posted by Noobeef   Well, it's already in there. It's a fine sand, not crushed coral. I can't tell if the edges are more jagged or not, but it seems to be pretty compact. It is a calcite substrate. Here's the link to what I got. Black Sand |
Well, the Seachem page you referred me to clearly states that the Gray Coast Calcite sand has superior buffering capabilities, so no worries there! The particle size on the FAQ page is listed as 1mm - 5mm - which is a bit crude for a denitrator, but it depends on what percentage of the particulate are in the 1-2 mm range versus 2-5 mm range. A finer substrate (ie.. 0.25 mm -1.0mm) offers increased surface area for bacteria to inhabit, and reduces the amount of sand needed to provide an effective anerobic zone beneath the substrate surface.
