Burly...I saw a segment on TV once about a midwest "farmer" that was growing organic veggies hydroponically (is that the right word? no dirt just growing them in water). He converted his barns to hold a white fish (tilapia maybe) and the water from the fish tanks provided the nutrients for the plants. It was a neat operation. He sold veggies and fresh fish and was looking to expand because he was doing so well since it was all organic etc.