I have a goldfish and I've been trying to cycle my tank for about 3 months. I've been through all types of nitrite spikes and everything. So today I tested my water and my ph levels were really low so I did a 75% water change. Now my levels are: pH- 7.6 Ammonia- 0 Nitrite-0 Nitrate-0 I'm happy that both nitrite and ammonia levels are 0 I've never seen that but I for the past few weeks I've had at least 10-20 nitrates but my nitrites were like .5.. What happened to my nitrates and is it bad that I don't have any? And is the tank cycled?