Need loc line help

[SteveG_inDC]

I am plumbing two 1” returns and have a bunch of 3/4” loc line lying around. Need some help figuring this out.

which nozzles should I use? See Pic for the six I happen to have. There are two return although I do have four splitters lying around. Should I split?

also is that straight piece with the vent meant to break the siphon? I can’t even tell if it accepts loc line.

 

[Reefer40b]

I say use the splits and direct flow in many directions, will go nicely when you add in some wave maker movement, giving you nice random flow patterns.