hi i just recently set up a 125 gallon. and am trying to cycle it i have 2 penguin 350s on it waiting on the fx5. the tank has been setup for about 3 weeks and the ammonia test says its a constant 2.0. but my ph is 6.6 so its not toxic? its nh4 not nh3 so will my tank still cycle if its ammonium and not ammonia? any help would be GREAT thanks