There are a handful of thread on Black Diamond Blasting sand. Some people are skeptical, but I actually switched to it today and it seems fine for my Bichirs.
I rubbed it between my fingers alot while cleaning it and it wasn't that coarse to where I would think it would be a problem.
View attachment 868035View attachment 868036
I looked into this stuff at one time, and may try it out on another tank in the future. From what I read, it is coal slag. Many people use it but no one is sure if it leeches anything into the water over time.


