Nice looking fish. Makes me want to add to my 2 males, but you already hooked me for one pair of babies! BTW- the little black one is showing he is afraid of no one! It's funny watching 2 little Oscars trying to school with fish 4x their size!
Sand initially does cloud the water. You'd need to turn off your filters until it settles completely as the grains can damage the motors if left to turn on while the particles are floating around.