My garden pond has koi and goldfish in it. I have a bird bath incorporated into my pond, the water is kept fresh using one of my two frog spitters. I had a pop bottle air powered skimmer that I replaced with a diy box skimmer. I also added an auto fill float valve when I added the box skimmer. The float valve is connected to my rain barrel collection system. New aquaponics setup and description located in the discussion section.