I have a 120 gal. in my basement that I am in the process of setting up,I also have a 30 gal. running on the first floor directly above the 120. I want to plumb them together using my 30 gal sump with aqua c 180 skimmer and Iwaki 30rlt pump,the 120 has 2 X 1in.drains and 2 x 3/4 in returns.I...