Sump question

[hecks220]

I have the exact setup as you...i run only a 3/4 overflow with a 1/2 return from a mag 7. my overflow is rated bigger at 500-600, using about 400 of it minus the friction and elevation loss. phosban reactors off the sump are done with filter floss keeping the phosban and purigen contained,built in algae refugium with miracle mud too and filter sock as well off the return...good luck