I found a bag of it at my LFS yesterday. I did the right corner of my 75 gallon tank with it. It looks fantastic!. My clown loaches and cory cat love it. I had to wash the hell out of it!. Like Buck said it stained my bucket black. I put it in my tank by lowering a bowl of it at a time very slowly. I was suprised that it didnt cloud my water.
125g Planted tank
Pres co2, 2x Filstar xp3's