Adding in a few more fish.

I added three more Koi and an algae eater or Plecostomus to the fish tank on the table system. The three Koi  that I originally had in there were not producing enough ammonia or nitrites to really add a lot of nitrogen to the plant bed. I am hoping the additional fish will raise these levels. I bought Wal-Mart fish and was surprised by the price. The Koi cost about 6 dollars a piece. Since this is an experimental system, I thought using Koi would be a smart alternative to Tilapia which is what I plan to raise in later systems, but Tilapia is actually cheaper if you buy fingerlings and buy 25 or more. My fish container is 4.5 cubic feet which equated to about 33.5 gallons. At 1 half of a pound of fish per gallon and Tilapia final weights being 1 and 1 half pounds, I should be able to put around twenty Tilapia in the fish area.