Does your 5' head include elbows 45's or reductions? I read a site that claimed for every bend curve or reduction, add 1 foot per. I'm running a 55 with 10 gallon sump my head is aroun 11' head. I use a mag12 with a in line ball valve for adjustment. Hope this makes sense and helps.
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Marty
50g reef, bubble king skimmer,20g sump,zeovit system, PM cal reactor
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