So I told me LFS I wanted to order a Fluval Spec/Flex 32.5. I mentioned that I only really needed the tanks, as I will be using Kessil lights and a Sicce return pump. My LFS is awesome and figured out that they could save me money and order just the tank from Fluval. . . now the only problem is I don’t have the appropriate return plumbing and I am not sure where to get it or what alternatives would be the right size. . . Help???