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The hammerhead is the closed loop pump, not the return. The return is a sequence dart throttled back to 1600-2000 gph.
What that group of doctors wanted is a solid reef system, with a minimum amount of headache and maximum return. Although costs could have been cut here and there, maintenance would increase and the overall project costs would go up. When I go with another skimmer that cannot handle a 450 gallon heavily stocked reef, I end up doing greater water changes. By going with top of the line equipment, maintenance to the tank decreases, and nothing will need to be upgraded.
John
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