Pros/Cons of external (builtin) overflow

[Fish]

Tony,
I chose external for the reasons already mentioned. My tank is onl a 20h so I could not afford to give up any more real estate inside the tank. I would go with an external overflow regardless of tank size. Another advantage is that you can have more overflow area than you would with an internal. The "coast to coast" is a good idea. It would result in only the thinnest layer of surface water being skimmed off the top. No buildup and much more efficient for your protein skimmer. I think.

- Chad