I have had my system operating over a year. I get a lot of growth and very little production out of my crops. My fish are doing fine, I feed them once a day. My PH is usually between 6.8 and 7.2. My Nitrates are between 80 and 100. Nitrites and Ammonia are nil. I add aqua Essentials on a regular basis, usually once a month. I have three grow beds that use the bell siphon. My system is in my basement with adequate ventilation and I use a HPS light source on a traveling rail.
Right now it seems I may also have a fungus problem, because my bean leaves show a mottled appearance.
I know I must be missing something, but have been unable to figure it out. Any suggestions?