Have you considered external overflows? I currently have one, and LOVE the fact that it doesn't take any space in the tank (and it looks better, IME).
But of the two choices you've given, I'd pick #2, simply because it would provide more surface skimming.
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz
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