As the base rock get infested with the bacteria and algae, it will increase the capacity to reduce the nitrate load, the whole system will constantly be in flux until you have stabilized the occupants as Steve was alludind to before. Short annwer is that it will impact it positively. As you add more fishes to the tank, this will increase the load which will promote more bacteria growth etc. Once the bio load is constant, the tank will come to an equilibrium. 8)
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