pump size for sump

I am in planning stages of adding a Refugium/sump to my 60 gal reef tank. I have very limited space because of my chiller and ballast for the lights so I was looking at the following: Precision Marine R24 Refugium with the Redline 125 skimmer...

Main tanks external water pump . Hammer head pump purchased from Marine Depot less than a yr ago , very quite pump . rated at 5000 gal / hr . $300 Thanks for looking .

Hey all, As some of you know I am converting my wet/dry. The next thing I need to do is figure out what size pump to use. Right now I have a Rio26HF that does about 1350gph. The tank is a 150 reef. I feel that the pump is overkill and part of my micro bubble problem. I also have a Coralife Super...