I am running 60% of my quiet one 4000 high head on my 75g and it's never hurt my pump, about 4yrs running.

Like many have said put a valve on it to reduce the flow but make sure you have atleast 2ft after the pump before the valve, also if you have the pump split now you could use it to run other equipment, ie chiller, bio pellets, phosban, a refuge or algae scrubber.... Even use it for WC's.