Return Pump

i have a 210 gallon saltwater reef and fish tank with a 75 gallon sump . I am using a Mag 18 as my return pump and it don't seem to have very strong flow back into my tank . Does anyone have any suggestions on  getting better flow back into my tank , I think the Mag 18 is not enough .
 
A Mag 18 is pretty beastly.  It can move quite a bit of water and handle a fair amount of head pressure.  Have you inspected the impeller to ensure it's in good working order?  A Mag 18 should have no trouble turning over your total water volume at least 6 times every hour. What size plumbing are you using for your return?
 
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