Not quite. If you target 6 GPM, then you must keep the pressure drop, or headloss to 8.5 psi, or 6 meters.
The head in the column has no relevance whatsoever. You're running a closed loop. Your column might as well be 50 feet tall, it would only increase the relative pressure: no effect on the pump (well, some additional restriction in flow, but negligeable).
What you need to figure out is what the pressure drop will be across all the components, then add that to make up the total pressure drop. Then, you convert the pressure drop into head, and lookup the flow rate on the pump chart.
Do try the little pump though. I estimate the flow to be in the fractions of a gpm. You could pee faster than that!
Watch for leaks: 3.5M, aka 5 psi will leak through a weak joint. Teflon tape is your friend!
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