The water looks milky because the bacteria are in the water column, thus causing the cloudy water. Once they start settling into your filter bio material, and into your gravel, and on the rest of the surfaces that the water comes in contact with, then the water will clear. Be patient and things will clear up in a few weeks. The Stability won't do any good in this case because you are not dealing with particulate in the water column. Keep using the Amquel or Prime to neutralize the ammonia. As far as how much water to change each day is subjective. Everyone has their own opinion. Personally I would change enough to keep ammonia levels at.50 or below. One thing to consider is while your tank is going through a bacterial bloom the bacteria are in the water column, so when you do W/C's you are removing bacteria also. The main thing at this point is to monitor your ammonia and nitrite very closely, and take appropriate action.