I have a 125gal. drilled with two overflows . My question is what size pump is recommended to pump water from the sump back into the tank. When it was a freshwater tank i used rio,s but i'm finding that the rio's are not good pumps. Would a much larger pump work better and just split the outlet between the two return lines. I have mostly corals and want to have the proper set up. I have three powerheads inside the tank, i'm mainly concerned with the filter end of it.