[qeorge]

MMM has an excellent guest post on how to get started with aquaponics here: http://www.mrmoneymustache.com/2014/10/20/aquaponics/

The author is selling his "Zero To Hero" design plans for a shockingly reasonable $10 here: http://www.frostyfish.com/shop/aquaponics-plans-2/zero-hero-...

And if you want to buy a 4x8 kit, he also has that for about $400: http://www.coldweatheraquaponics.com/shop/aeration-2/zero-he...

I've been wanting to try it, but have not as of yet.

[asciimo]

People tend to overlook the necessity of feeding the fish. So your resource chain goes fish food -> fish -> waste (nitrites) -> plants -> human food. Applying nitrites directly to the plants would be more efficient.