well Since no one is helping much, im going to attempt to draw in a crowd with pictures lol.
I was testing my layout. Thinking of doing it like this then flourite black sand mountain. Borderd with some styrogene.
I dont care what anyone else says, putting both of these sands in was a PITA. Dont mind those out of place stones. Those are removed and were there to block the black sand from coming down.
Gotta clean some of that up
I broke up some more slate and actually laid it on the mountain to give the mountain some meaning. Also so the black sand wont trickle its way down to the white sand. The tank is very cloudy right now. I washed the white sand but not enough. The black sand was very clean.