09-14-2012, 04:31 PM
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Originally Posted by 1077
Have been using 20/40 black diamond blasting media found at tractor supply for a year now in a couple tank's.
Read a ton of post's on planted tank forum's before trying it, and those that use it have had no issues,including me.
50 lb bag goes for around eight bucks in my neck of the wood's.
Thanks 1077, I did some research and the coal slag's an inert by-product of burning coal. Considered environmentally safe and non-reactive. Think of it as like a "black glass". $8 for 50lbs locally for me also, so I'm going to try it some time. Abrasive, since it's sold as an abrasive(!), but I'll use it in a tank without cory's. I think the term "slag" was throwing me off.