Now that you are sure that your rock has no die-off, you should add ammonium chloride (not household ammonia/ammonium hydroxide) to feed the nitrifying bacteria (nitrogen cycle).
You can simulate a bioload by adding 0.01 grams of ammonium chloride (dry crystals) per gallon of water. This will give you an ammonia level of 1ppm. Check the ammonia level to make sure you got the dose right. Depending on how much of a filter bed you have already established, it will take one day or several for the ammonia to go down to zero. When it hits zero, add a slightly higher dose (0.015 grams/gallon) to render an ammonia level of 1.5ppm. Continue to dose at this level until you start stocking the tank. The livestock will supply all the ammonia you need for the nitrogen cycle.
You will start to see nitrite as soon as the nitrifying bacteria converts the ammonia. It is safe to add livestock once the rock is able to maintain nitrite at zero while you are dosing ammonia, which may take a few weeks depending on your rocks bacterial biodiversity/filtering capacity. Nitrate will start to show in tests after a few weeks of nitrite reduction. The family of bacteria that assimilate nitrate take the longest to establish. Once you have established nitrates below 10 ppm you can start adding sps corals. At this point in time phosphates will be a concern. Throughout this cycling process you need to monitor PH as it may drop with heavy bacterial growth.
Alternatively you can use livestock to feed the nitrogen cycle but it puts a lot of stress on the organisms you use and it is more of a shotgun dosing system. The chemical route is faster and safer.