Aquaponics in my Koi pond?

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Question by matt: Aquaponics in my Koi pond?
I thought this would be a easy process by using a planter box filed aquarium rocks for the growing medium. Air stones inside the planter box to create oxygen for the roots. And simply place the box inside the Koi pond. This sounds too simple could someone please tell me if this would actually work?

Can you help? Leave your own answer in the comments!