bubble trap problem

[poo-tang]

i have a 150gallon tank i just finished building and is now in service. i put (2)1.5" standpipes in to deliver water to my sump...a 27 gallon rubbermaid and the other to deliver water to my denitrator(located in sump) and to my diy protien skimmer. currently i am dumping my skimmer uinto the sump which is plumbed externally to a opump and back to the display. i have no bubble traps, just 90 degree el looking down close to the bottom of the sump. this works okay for now, because i am planning on dumping my skimmer into a fuge and then to the sump.
right now when to skimmer is off i have no problems with bubbles in the display. so as long as i can return the water from the skimmer through the fuhge bubble free i am home free.
how should i go about setting up the fuge?
i will definetily be putting a 1 inch bulk head from the fuge to the sump. should i put ina bubble trap just before the fuge overflow, or do i also need a set after the skimmer dump. or maybe just one set of bubble traps after the skimmers dump into the fuge.
all advi ce appreciated, i am just trying to do this the easiest and best way, and only once.