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Just wanted to share a pic of my first grow with dual zone with aquaponic system. This was a small pot, now I grow with 7 gal pots (second pic) and still using dual zone. This pic give you an ideal how dual zone work. Some people say that it must be hard to grow that way, for me it is the opposite after the fish tank is established (ammonification) and using super soil for the top layer,  no need to check EC and PH,  just feed the fish and feed the dirt with worm casting tea every two weeks.