I also use black diamond sand. Love it! You just have to clean it really well. Mine came oily but I left it soaking over night in 5 gallon bucks and the oil all came to the top of the water so was easy to get off. Not all of it came clean, but in less then an hour in the tank it was all gone.
No, those are not my husbands tanks.
46 Bow Front Planted
Eheim 2217, 2-39wt T5 bulbs (6700k)
Onion plant, amazon sword, red lotus, Christmas moss, and crypt lutea. 7 pristella tetras, 7 cardinal tetras, 2 Otocinclus, 1 patty, and several cherry shrimp.
All Male Hap, Peocock, and Mumba Cichlids. Plus yoyo loach and zebra loach.