My brother grew a cbd plant in a aero garden. The biggest thing I think is that the res never gets swapped out. Your probably needing micro like said above, but you also probably have root rot and plenty of bad bacteria and no good bacteria. I would invest in hydroguard for this set upThink I may have found at least AN issue, maybe not the issue but a factor no less. Severe micronutrient deficiency. Your aerogarden nutes are only macro nutrients (per their label), you're missing, sulfur, manganese, iron, boron...a whole bunch of stuff.