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 Since the tank is already filled, I would just skip the sump.  Buy a Deltec skimmer (the only HOB skimmer that's decent IMO) if you want a good skimmer.  I know a couple people who have drained their tanks halfway and drilled the back panes.  I wouldn't do it, but they didn't have any troubles.  That's a thought if you're brave (or crazy). 
				__________________~ Mindy 
 SPS fanatic.
 
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