I have a 29 gal tank. I had some fish (2 honey gouramis) in there but the nitrites spiked so I took them out and have them in a different tank for now. Ammonia has been at 0ppm for a few days and my nitrites were between 2-5ppm (purple is incredibly difficult to read). I did a 90% water change. Nitrites were then at 0.25ppm and now are back up to 1-2ppm. Nitrates have been at 5ppm for about a week now. Do I need to add a source of ammonia while my tank continues to cycle? I don't want it to stall or restart if I don't have any source of ammonia. Thoughts? This is a new tank. I have established media in my HOB filter I received from someone else in the hobby.