This simple and cheap aquaponics system has cost me only $3 dollars. I have channel catfish in my indoor aquaponics setup. This system is just starting. After 12 weeks my channel catfish aquarium has cycled. I'm going to start feeding these fish and documenting the catfish growth rate. These fish are intended to be in the greenhouse system, only problem is that the greenhouse isn't finished yet, so I'm going to see what I can make happen indoors. I plan on having a much bigger catfish aquaponics system soon in my greenhouse but for now this indoor aquaponics for beginners type setup will get me going.