I set up a new 37 gallon tank a week ago and have been cycling it since. I used an old Fluvel filter sponge from another tank of mine, have used about 3 bottles of Tetra Safe Start now, and am keeping the conditions perfect for the bacteria to grow, but my ammonia levels take forever to drop even slightly. I'm feeding the bacteria with pure ammonia from the hardware store but I think I added too much and stalled the cycle in the beginning, so I did a water change and added more TSS. Basically, it takes about 2-3 days for my ammonia levels to drop even 1 ppm. It was stuck at 4 ppm for days and finally dropped to 2 ppm and is now stuck there. Nitrate are consistently 10-20 ppm. No nitrites with the TSS. I'm worried at this point it'll never be able to handle 2 ppm within 12-24 hours. Is it normal for the ammonia to drop so slowly over a few days or am I just being too impatient?