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Head is the vertical column of water that exerts pressure on the pump, same as if you put your thumb over the discharge. But tube friction also increases pressure so the pump has to compensate for long runs especially if small diameter tubing is used. That is why some pumps have only one hose size.

My advice is to get a DC variable speed pump, then you can adjust to suit. If you get a stronger single speed pump, you can make a simple bypass that diverts water back into the bucket via a ball or gate valve. You can add a discharge valve to fine tune

PonicsPump PP40006 is an inexpensive pump that would probably rate down to 200gph in your setup, and you can adjust the input screen and forgo the bypass valve if you move closer to the tank.

I have a Jacod DC variable pump that so far has performed flawlessly.
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