I originally put my tank together about a year ago and after it cycled, my water parameters were pretty stable for about 6 months. After that my ammonia levels spiked and started reading over the maximum that my liquid tests would read. I started doing small water changes every few days, using sea chem prime, put in an in-tank filter, replaced the other filter with a higher quality one (kept the bio rings from the old one), and added sea chem denitrate media into my filters. After a few months of no improvement, I did a 90% water change, added tetra safe start, and added some used filter media from my lfs to try to instantly cycle the tank. After testing the water a week later, my ammonia levels are off the charts again! I know it can't be my tap water since I have a 5g that is doing great. Hoping to get some advice on how to get my ammonia levels under control again.