Originally Posted by
Floyd R Turbo
You can cycle the tank by adding ammonia, but you have to be careful to keep the level below 4ppm or the cycle can stop. I use the janitorial strength ammonia from Ace hardware, it is free of surfactants and double-strength, you don't need much.
As far as interfering with the cycle, not really. If you don't dose ammonia, but instead put in a bunch of live rock (not dry base rock) then you would normally have a mini-cycle, which might end up being 'invisible' because the scrubber would uptake the ammonia from the rock. That also depends on how fast the scrubber starts growing though. But, the bacterial colony will grow no matter what, because they live on the surfaces, so they will get 'first crack' at the ammonia/waste.