Sunset Sherbert - Aerogarden

You need to find out why you have such wild fluctuations. This starts with a full on res change. You also need to measure EC regularly. Google "EC pH hydro chart" and it should give you a good idea of what your issue is based on these two reading. Organic nutes tend to be less stable as far as pH goes, so that could be your problem. Good luck either way, message me if you hit a dead end.