I set up a tank three weeks ago and am doing a fishless cycle using pure ammonia. My ammonia have stayed at 5ppm for the entire time without even a little drop. Is this normal? I thought by now I would see some drop in ammonia and then I would add more ammonia to the water to bring it up back to 5ppm. But I can go five days without adding anything and the levels still stay way up. Should I be seeing anything yet? The water did start to become cloudy a couple of days ago; not sure if that means anything.