I am building a cooler live well for the back of my pontoon boat. If I set it up to continually pump lake water into the bottom of the cooler and drain out of the overflow near the top of the cooler, will I need to have an aeration system also. The water supply pump will run constantly like the aerator pump would normally run. My thinking is there will be a steady supply of fresh cool lake water which the fish live in already so it should be fine for them. Is this correct.