I would like to share, my aquaponic setup I recently made. I got a lot of helpful advice in another thread I had started about what creatures to use as the source of poop. I found a source for free guppies in my county. They give them out for people who have ponds, to control mosquitos. http://www.youtube.com/watch?v=CFjIVzuD9_E
I spent around 60 dollars. I am sure it can be done for cheaper. The most expensive part was the pump. About 20 bucks. My county also puts chloramine (as well as chlorine) in our water. Chloramine cannot be cleared up by letting the water "air out." I purchased a liquid cleanser for aquariums that eliminates chloramine.
It is a 200gph pump approx: 25 gallon tank 18 gal. grow bed with 13 inches of red lava rock 20 guppies
I will put some seedlings in a few days. I have cucumber, a pepper plant and basil. This is completely experimental, I don't expect anything from this, except a learning experience. I had lots of fun and hit a few obstacles constructing it. All in all, good times.