Aquaponics: is the symbiotic cultivation of plants and aquatic animals in a recirculating environment. Alternate definition: An integrated hydroponics (growing plants in water) and aquaculture (growing fish) system. http://en.wikipedia.org/wiki/Aquaponics
Aquaponic systems can be small like this one or large commercial setups. I have found http://www.aquaponicshq.com and invaluable source of information.
This system is very simple. Basically I put a box on top of my fish tank and pushed the pump through it and added some holes rocks and plants.
Step 1: The Grow Bed
In this example I have used an old plastic storage box. I drilled two large holes on one side.
1 For the Pump to go through
1 as an over flow valve in case drain holes fail.
Along the one side I drilled a series of holes to drain the water back to the tank.
Then simply placed the container on top of the tank at an angle to allow the drain holes to be flow back into tank and the pump and over flow to be near the top. (Look at side view)
The pump I am using is the standard pump that came with the tank. Any pump will do just needs to pump water from tank to the grow bed.
After washing the grow medium I place it in the grow bed.
Now I let the system run to ensure it doesn't over flow and look for any issues.