I have a questions about the flow rate and also flow direction? I have a 90 gal 48"X18"X22". i have (2) korlia 2's@ 600gph, and (2)korila 3's 850gph, and return from the sump is a rio 2500 pump @ 530gph at 4feet with a single return. i have a 55 gal sump about half full. with a refugium in it...