I want to buy a sump setup for my tank and i was wondering what should my gpm be for my return pump(also how many pumps) with a 40 gal tank and 13 gal refugium/protein skimmer sump.
http://www.petsolutions.com/storefront/product-view.ep?pID=ProFlexSumpFiltrationSystems
http://www.petsolutions.com/storefront/product-view.ep?pID=ProFlexSumpFiltrationSystems