**what Do You Think,overflow ?**

[Hammsreefbeer]

Im thinking of turning one of my duel returns into a drain backup.my overflow only had 1 hole drilled.I was thinking also thinking it would help the pump out so its not working so hard.its a eheim 1262 w/ roughly 7-8 ft of head.I figured im at about 5-600 GPH.i get all my tank flow from the tunze's.
What do you guys think about this,Or should i have water returning from the sump on both side of the tank?
thanks for looking.