Hi everyone. I'm having an issue getting my 20 g tank to cycle. I'm doing a fishless cycle with Dr Tims ammonia. I have a sponge filter, a HOB filter, decorations and slate on the bottom. I have the heater set to 85 degrees. Stability didn't get my ammonia to drop nor did Dr. Tims one and only. I added two bottles of TSS within the last 3 weeks and saw a bit of a drop in ammonia. It seems that my ammonia will only drop for about a week and then when I redose ammonia it stops dropping. I have yet to see any nitrites but I have somewhere between 40-80 ppm in nitrates. Can someone please help me? I'm getting very frustrated with the whole process... Here are my current ammonia nitrite and nitrate readings.