The material with the largest grain size will migrate to the top, in your case the ColorQuartz will be on top, but there may be some sand that shows through. If the sand is a different color it might be a visual problem. You'd be better off taking the sand out. Don't forget that ColorQuartz is inert, it inherently has no CEC capacity or food for your plants' roots.
Aquascape? I'm a crypt farmer.
It's a fine line between fishing and standing on the shore looking like an idiot.
That IS an aquascape, it's titled "The Vacant Lot".