I have a 55 gal tank with one shubunkin goldfish. I plan to get another one, but I read never to add more fish until the cycle is complete. But... I started the tank over a month ago, and it seems the cycle hasn't even started yet. Every time I test the water, the test results are 0 ammonia, 0 nitrites, and 0 nitrates (using a API liquid test kit). My pH is high (8.4) but steady. I have been doing 20% water changes every other day. I use SeaChem Prime to condition the water. My tank has a bubbler and a 70gal filter. Is there something I'm missing?