Hi, new fish keeper here. I set up a tank two weeks ago, and I was waiting on some plants before I added fish as I was unable to find suitable ammonia to cycle it. However, last week when I finally found the plants I wanted and put them in I had an ammonia spike (4ppm). I have no idea what caused it (I think it might have been the pot the plant was transported in, as my gravel isn't deep enough for me to plant it fully and it kept floating off so I had to put it back in its pot. Before that I had 0.25 ppm Ammonia, 0 Nitrites and between 5-10 ppm Nitrates. I am now at 4 ppm Ammonia (it did fluctuate a little but it hasn't dropped yet), 0.25 Nitrites and 20-40 Nitrates. It doesn't seem to be following the nitrogen cycle in the way I understood it so I am not sure whether I should wait it out or whether a water change will help. I do have bio balls in the filter. Does anyone have any suggestions?