First of all - it doesn't sound like you have ANY pumps or powerheads or filters going in your system right now...
You need to turn on all of your pumps and powerheads and filters and everything - get it all running to the max and then wait for a couple few days. The finer sand settles underneath a course layer of top sand. It happens in all new tanks. Just keep the water current going constantly. I know it doesn't make sense, but you will see.