I'm building a 125g build has a 55g sump , he wants tank visible from both sides. So I was gonna put PVC overflows on both sides and run the returns up the sides and over the top(approx 6ft)and split the return into 4 I'm thinking 4 eductors I can't decide between a mag 18 or a mag 24 , that's what I need your help for ! Give me your best advice?


