90 cube drainage silence

[ReefCycle]

I have a 90 cube with the awful close overflow. When I plumbed it originally I was so focused on using slip fittings to bulkhead for ultra low profile bend ( to get tank as close to wall as possible) I never put a flippin vent drain! So I was cursing the thought of having to go nuts cutting drains and making tee fit in there when I came across this. I am going to try it unless I hear huge failures, but a non pressure drainage line with fittings and stuff to add pipes for air should be good. I was even thinking of just drilling hole large enough for some to tubing and just run that threw the pvc hole

 

[ReefCycle]

P.s. I devoted both rear facing inch bulkheads to drainage and return comes over the top and feeds a sea swirl.

 

[ReefCycle]

Ok so here's the saddle installed (not drilled yet) wondering if I should just drill a larger hole and just have the ro line in the pipe. Attached are pics to show what I gota

 

[ReefCycle]

Nothing? Am I in wrong forum?