yeah, i haven't used it since......LOL in fact, with the exception of my mantella tank, all of the substrates in my tanks have been black for a long time. in fact, for the longest time, i used to use Black Diamond Sand Blasting Grit. it's black as coal (basically volcanic rock smushed to smithereens) and it's only $8 for 50Lb at tractor supply stores. i KNOW you have to have one of them around you......LOL