Dennerle Shrimp Sand
The dark color is perfect to set off my crystal reds. Also not super dirty, so quite easy to clean/prep.
Used as a cover substrate over top of crushed lava. Trumpet snails burrowed right in as did the freshwater clams! They are all "Happy as clams!"
2" of sand is also holding plants firmly and they appear to be taking root well. Just bought a batch for my big aquarium!