Good stuff!
It looks like your check valve will be below the water line, keeping water in the line, but the pump is above the water line. I would think you would still have to do your initial prime by pouring water in the tank to get water to the pump to draw. The Hobie design uses a 90 pick up that uses forward momentum to draw in the water.
Water inlet at the bottom of the tank is a great idea as bait will die down there with plenty of fresh flow just above them.
interesting stuff with the reverse polarity switch, I really like using 6 volts.
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