Just got my wye splitter for my return. That sucker was hard to find. Couldn't get it in home depot or lowes. Finally found it online through a pvc supplier. Cost me $13 with shipping. *sigh* the things we do for our tanks.
I guess we'll put it right at the beginning, just right after the pump. hopefully we lessen our headloss. Also my lfs told me they received the checkvalve for my return...but unfortunately, they sent a 1 1/2" valve! The lfs did say, tho, they they use larger check valves for theirs, and they just use reducers. Still debating if I want to have them send it back for the right one, or just do what they did.