i have a 75 gal tank right now i have 1 mag 5 for my return and 1 mag 7 for my skimmer. i would like 2 know can i use a mag 18 or something bigger to run my skimmer,return,uv,and my phos reactor all off of the same mag pump? I'll like 2 know is there a way i could hook my uv up to my return so all of the water out of my sump have 2 go trew the uv into my main tank?