External is typically the preference however it comes down to the desired layout (how the tank fits in your spot). If the external is too obtrusive then internal is the only option. For internal overflows my preference is a single small center or corner overflow. IMO coast to coast for internal takes up too much space and I'm not a huge believer there is any "real" worth while advantage to it. While the theory of better surface skimming holds true it's kiboshed when you consider the screens typically used and the surface agitation/waves caused by in tank flow.
Last edited by sphelps; 10-21-2013 at 05:26 PM.
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