We can all agree a mak4 is a " normal " pump for a beckett injector ... a mag 18 although higher in rated gph is not pressure rated so wont be as effective ... so all that is going to happen is if he uses a " normal " pump is to get the water column that high he will have to restrict the output end of the skimmer to adjust his foam level in the reaction chamber.
He will as CanadianMan has stated get really good contact time but wont be able to process as much in terms of gph as a similar skimmer with a shorter reaction chamber.
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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