Sorry to jump in with this but... IMO stay far away from hang on overflows. I know many people use them all the time with success... but the chance of a screw-up with them is about a million times more likely than with a sump... If they fail... your sump will effectively be emptied on to your floor (via your main tank). Its cheaper to get a hole put in and use the right plumbing than it is to use a much more risky hang on overflow. Just my 2 cents.
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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