I own a bait shop and sell minnows during the winter but didn't want to pay thousands for one of those commercial tanks so what I did is bought a used chest freezer holds probaly 150-200 gallons of water $100.00, Got a 2 hose arator system $40.00, a decent canister filter $100 with all the filters and pads, and a external thermometer The one you use for brewing beer $30.00. The thermastate will allow you to set the water at any temp you want I keep mine at 38 degrees. I do a complete water change every two weeks or when needed you most remove chlorine from the water if you use tap water you can get the stuff at the pet store. add a little bait saver which keeps the ammonia down and good to go. The whole set up cost me $275.00 and can hold around 20 pounds of bait (2000 minnows)