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Scotch , you need a pump. Either you need to keep oxygenating the water in the tank or you need to keep pumping in new fresh water as they do on many boat livewells. Just a big tank with no way to airate the water will not keep them live at all.
I have a Keep Alive system. It works great. A little ice now and then to keep the water cool. The keep Alive pump pumps the air down rather than the water up. It airates better and a battery lasts a lot longer. This year I want to try the ammonia tablets.
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