Heres an old pic of the tank I use at home to store bait.I've since added a "cooling loop" buried underground to help maintain a more constant water temp.Also along the back wall I added a piece of 3" PVC pipe,sealed on each end,with a wide slot cut out on the top that runs the length of the tank. In the pipe I put filter media and have a slow constant water flow into and over it to promote bacteria growth.Cost was approx. $50.00 for parts. The red bucket houses the pump and more filter media.Copper pipe at top along center line contains 3 sprinkler heads from a commerical sprinkler system. The 2 filters are charcol(large one ) and a dirt/debris(smaller one on right) filter.