Built this dandy greenhouse and aquaponics system last fall. I've been waiting all winter and spring for water temps to come up. Ordered my first 100 blue nile tilapia a couple weeks ago and got about 80 1/2" fry instead of the 2" fingerlings I ordered. Disappointing but not fatal. If I don't locate suitable tilapia fingerlings soon I'll have to go with the local favorite, blue catfish.
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Vertical stacked tanks for fish, gravity fed flood and ebb grow beds, bottom sump tanks for dwc and duckweed, 400 watt pump through a sand filter pumps back to the top tank. Works well at 800 gallons but will hold 1000 gallons total. Lots of falling water and well ventilated surface area for gas exchange. Should work.