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				 to sump or not to sump 
 Pardon my ignorance but if you predrill holes for the future and then I presume you add some sort of stopper.  How do you add the equipment at a latter date with out popping out the stopper and having water run out?  I am in the midst of looking at getting a 50G tank with a sump etc and I am interested in this also.  The above link is good help.
 Thanks
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