Best is Use the top mounted dip tube. The bit remaining will not be noticed I built my own tank of Nytex and epoxy but I built in a floor depression that the dip tube sat into with about 1" clearance so almost empties 100%.
If you insist on using the bottom port then install a shut off valve. Failure to do so will result in you getting bitten when the pump fails and the tank is full.
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