Tank has been cycling since June 18th and from July 8th to the 15th the ammonia levels have been 0ppm or 0.25ppm despite me dropping the right amount for the tank size and I had to do a mini water change on the 17th due to the nitrites being a bit too high and I didn't want it killing off the nitrates and checked the levels after a day since reading that it needed to stabilize after a water change and Ammonia was 1.0ppm, Nitrite 1.0ppm and Nitrates 40ppm which I found strange since Nitrates was constantly 160ppm for the past week and a half before the water change.
I just checked a few minutes ago and everything is 0ppm even the ammonia which I actually doubled yesterday just to see if anything showed up and it still says 0ppm. PH levels are 7.0 so it can't be that and I have the heater and water filter running.
Can anyone try to explain what is going on? I haven't touched the substrate or plants in the tank either.