I'll do: tank overflow to fuge---> skimmer---> return. The reason being you want the raw/dirty/dingy water to go to the fuge first so the macro/small critters can get fed, proccess the dirty water, then to the skimmer for further proccessing, then return to the tank. That's my understanding on how a fuge sump should be setup, I might be wrong and if I am please correct me.
Raf