I have two live wells in my boat one bait one for big fish. Both have these rule style pumps and a drain (or pump) to Overboard. But there is a fitting inside the tank that when twisted allows you at adjust some level of air injection. It works OK not great. But IMO just pump new water in and let it drain ob...its better then bubbles. I have kept any fish alive in these tanks. (included big fish)...
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