Thanks wkndracer... I've read this but I just think there is a lot of info lacking here.
While the thread wanders a bit with opinion a couple times reading the follow up posts the details are there in the sticky thread.
Black Diamond is a media blasting material.
Cool. That is one I've been considering. I think it looks cool. Do you have any photos posted online of your setup?
A few others had posted about using it so I dug the net finding details and have loaded 8 tanks using coal slag (Black Diamond, Black Beauty blasting media).
Photos and details about using it in my journal threads although most have a soil base layer.