Can any one take a stab at his. I have a 125gl with a pen bio 200 and 350. I also have a wet dry system on it as well. Ive been trying to cycle it well over a month now. My ammonia level has not moved. But during this time the nitrites have came and gone. And now I have nitrates and still high ammonia. Whats going on here? Isnt the ammonia suppose to be gone by now?