I have recently set up a new 55 Gallon community tank, and I was tired of plain old beach or play sand, with or without gravel it's just too bland for some fish.
So I bought 2 bags of TCC black blasting Grit, and though it requires so much more rinsing than any other substrate I've yet tried. (gravels real and fake, sands of various types including tahitian white moon)
If you choose to use this material for this purpose, I seriously recommend having a few large containers you're willing to destroy to do so.
Rinsing it would be much easier if one merely ran water into said containers and lifted handfuls into a different stages of cleaning.
I went the dumb route and tossed all of it into a large sterilite, and proceeded to run through about 200 gallons of water, just to get it halfway rinsed. then did the buckets, and then into the tank for it to cloud like crazy once I added more water.
Tally up to this point, I'd said about 300 Gallons of water to rinse it. Most of which is making our sidewalk weeds grow nicely.
I do Have to say, it is a nice look in the tank, very dark, with a nice solid black painted backdrop. It however isn't uniformly black, though it has larger pieces that are like obsidian, and smaller muted black granules, and some Very dark greyish silt like sand particles.
Overall I am very happy with the material I used, I aimed for black sand at 7$ a bag and Got a nice monochromatic material that if properly rinsed can look very nice. Think even the Grey is Starting to look better to me.
I'll try and find a link to it to post up here eventually.