I currently have 24 pieces of vinegar-cleaned dead rock, cycling in a container with saltwater from my existing tank. I am estimating in will take 2-4 weeks to get my water levels correct in the container and I can then start adding the rock to my established tank. Since my tank is really running weill, I would hate for the new rock to mess up anything. Therefore, I am wondering what is best... 1) Add all new rock at once. 2) Add e.g. 2 pieces per week, during water changes. (12 weeks to add all) Logically, I am guessing that no. 2 would be smartest to avoid any risks of effecting the water. However, it of course means that my Aquascaping must be done over a long time. I am just wondering, what effect this constant rock-changing could have on my fish? Do any of you, have experience with adding new cycled rock to an already established tank?