Ugh my tanks have completely stopped cycling. I got a nitrite reading about 2 weeks ago and then some nitrates. I did a change the substrate since then to sand. After I got the substrate and a PWC I dosed the ammonia right into the filter. It's a whisper internal filter. Since then my cycle has been frozen; do I need to start all over? I did some water changes to remove the nitrates and nitrites that were in the water. I even got desperate enough to throw some Safestart in the tank since the freeze about 4 days ago. So now I have been stuck with ammonia and it's not budging at all. Any ideas?