Overflows. Internal or External

[kien]

Originally Posted by Madreefer

I should have explained better. My tank right now is 29" wide and 5 1/2" away from the wall. If I went with the 6" external overflow which would be ideal, my tank would stick out 6" more so a total of 11" from the wall.

That sounds to me like you are wanting your overflow box itself to be 5 inches away from the wall. That seems excessive. Does your overflow box need to be that far away from the wall? All your plumbing runs down from your overflow box, not out the back of your overflow box doesn't it?