Tractor supply sells a sand blasting "sand" by black diamond. Its dark mostly some of it is slightly greenish charcoal colored in the bags I got anyway, but overall its dark charcoalish. Size I got and was recommended to get in blasting abrasives is 30/40. So if you don't like that color at least stick to that size in other brands
J
jaws7777
Polyaddict86
and a few others use a garnet blasting sand that is red in color from Barton I could not find it anywhere near me. But that stuff is red anyways I think you'll like the black diamond, I mixed it in my main tank with pfs and put it in my grow out/refugium.
