Originally Posted by ruht roh
That's the first time I heard a criticism... Care to elaborate? Which substrate are you talking about? Why is it bad?
Considering the fact that I haven't heard anything either, I am not sure why it is crap.
Btw a put together a thread on another site with details on all these different black sands. http://www.fishlore.com/fishforum/fr...-blasting.html