I’ve just begun cycling a 55 gallon as you can see on my other post but the tank is already reading nitrates. It hasn’t been been running for a week and earlier today when I tested it ammonia was at 0.5 ppm, (ammonia was the only thing I tested at this time), and then later today I tested again and ammonia was 0ppm, nitrites were 0.25 ppm, and nitrates were 5 ppm. I was a little confused, but I guess it could make sense since I moved over an already established filter cartilage from one tank to this tank. The pH is still pretty high (8.0) which makes sense since the tank did just start running. I’m doing a fish less cycle, the tank has two airstones, a heater, and live plants. I haven’t treated the water at all because I want the nitrogen cycle to start. Definitely still not adding fish for a while, but was curious to see what others had to say or if anyone else has had this experience?