Hi all. I am planning to have a long cycle and take it easy throughout summer and start adding corals and fish (apart from my cleanup crew) around September. Looking at sand and I like the AF Bio Sand.. Do I need to add the bacteria which comes with the sand? Or can I not use it since I will have established stone with its own bacteria? Also I have seeen many adding sand to aquariums with water already in the tank.. can I add the sand prior to filling up the tank?