Wondering if anyone has experience using black blasting sand, its pretty cheap comes in 3 different grain sizes. Was wondering if have used which grain size is most effective for plants and how effective it was for planted tank. Have used play sand in the past and filter sand but would like a dark substrate and rarely find black in play or filter sand. A 50Lb bag of black diamond blasting sand is about 7 bucks. Im pretty sure its the same as fish store carib sea brands but not sure??? Any thoughts?