Pros/Cons of external (builtin) overflow

[Delphinus]

No, not against drilling... It's just that I've seen a few overflows where the glass was notched lower and the overflow was on the outside of the tank instead of the inside; and because the glass was notched there's no U-tube.

Deb's trig tank is setup this way .. it's really cool. With the box part being on the outside only, all the available tank volume is available to the display. Whereas in the traditional internal overflow you have to work around it.