Lost my mind....or, here we go again!

[Delphinus]

External overflow unless you need the tank up against the wall. I HATE how much real estate my internal overflow eats up out of my 280g.

Center overflow, or coast to coast. (External or internal, either way). That way if you go wavebox the wave will be minimized at the overflow and sloshing is minimized.

Leave enough space over top of the overflow. Especially if you go with a non centered overflow and you have a wavebox.

I think Herbie > Durso. Durso really only good for reducing gurgling noise. Herbie is quieter and makes microbubbles pretty much impossible since there is no way for air to enter the plumbing. Well, except for the skimmer anyhow and anything else, but at least the overflow intake is submerged completely so it can't draw in air.

There's another kind of overflow system whose name I can't remember but it's basically Herbie extreme. You need 3 holes for it. That might be something to look into.

[lastlight]

Beananimal. I've never really gotten the point. I think Herbie is the shiz.

I'd totally love to have a coast-to-coast next time around. Take the thinnest sliver off the surface and if it's wide enough and you're not trying to force 10,000 gph through your sump you really don't need eggcrate or anything on the overflow.

[Delphinus]

"Beananimal" ok thanks. I couldn't remember it and it would have taken easily 2 minutes of googling before I stumbled randomly across it.

I agree, I think Herbie's are completely it. I'm not sure what this beananimal has to offer over Herbies, but I thought I'd at least bring it up because there is nothing worse than finding out after the fact about something else you could have considered.