so my LFS sold me sand for substrate....OptaMinerals brand, ebonygrip copper slag, medium grit. Does being a copper slag affect anything. I got super ripped. Two 50 pound bags at 55.00 each. Now I see I could have bought the exact same thing at Princess Auto for 15.00 per bag. I was going to buy B;ack Diamond at Home Depot, but dear Hubby thinks I should pay more and buy it only at a petstore.....ugh. Silly me, shoulda gone on my own and just told him it came from petstore....lol. Oh well, if I need another bag for my 75 gallon, I will know where to buy the next bag. Anyway....will it being copper slag affect anything?