I went with flourite black sand for my 100 gallon tank I'm working on. It doesn't look so grey in real life, but not jet black as I'd hoped, either. Getting my first really big load of plants at the end of the week among which will be a lot of ground cover though. I didn't rinse this stuff because there was just so much of it to deal with. Don't know if that would have made it look blacker or not, but here is what I got out of it. I'd say if you want that jet black look, stick with the regular flourite black, rather than the sand like I used. I'm actually toying with the idea of getting about 4 bags of the regular stuff, rinsing the bejeezers out of it, and sprinkling it across this as a top layer to get more of that jet black apearance, but not sure if I'll bother. <<shrug>>

