sump help

[DanRamirez57]

i am currently building a sump for my saltwater but dont want to drill my display, anyone know how to make it work?

 

[Jeremy S.]

Hang on back overflow box. Ill have to dig up the box for the brand of the one I bought but you can see it in the back middle of my tank in this pic.
(To the right of the heater)

 

[obscurereef]

Don't have this, but heard they can be a pain with adjusting at times.
CPR CS Overflow Boxes

I use this for my return:
http://www.marinedepot.com/U_Tube_w...ng_Parts-Plumbing_Parts-FT0001-FIFTRP-vi.html