Nature's Ocean is a brand of live Bio Active live Aragonite Black sand. With about two pounds of sand per gallon in your tank you will have enough to cycle the tank in a week or so with the rock you want to "Bleach." From my experience, and again it is just a N of one bleaching is not a good idea. The rock will become completely sterile and thereby can and will leach out a greater amount of phosphates into your water with time, the bleach (chlorine) can become entrapped in the crevices of the live rock and cause short term issues in your tank and cycling, The chlorine in the bleach will not remain a stable ion in the water and will combine with other chemicals in the water and "can" become toxic, again short term to any live stock.
While bleaching is a common practice, so is unexplained sudden deaths in our tanks after a few weeks or months into the hobby, please proceed with caution and be sure to rinse very well and rinse with fresh clean water and soak the bleached corals in clean water then place in salt water for a few days and rinse in salt water if you do decide to go the bleach route. I will say this the bleached white rocks against the black sand so pretty and breath taking. So i do understand why you would want to go this way, the white rocks will only stay white a little while until they first turn start to age. You can expect an algae growth on the rocks from phosphate release, about four to six weeks after you add some live stock, just beware of this, it is very common with bleached rocks, at least from my limited experience.