Quote:
Originally Posted by rroselavy  Black sand? You may want to reconsider and get some fine (oolitic) Aragonite sand. Oolitic Aragonite is spherical in shape, so it tends to pack tighter than larger grains, especially non-Aragonite sands that tend to have sharp edges. Packing tighter means more sand per square inch, and thus more bacteria than looser substrates - and it tends to trap detritus less readily than larger, jagged grains.
The other benefit of Aragonite is its ability to provide a (slowly dissolving) source of calcium (even at higher pH levels), thus helping to maintain more optimum alkalinity levels. |
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
