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Seaheard.. have you checked to see if the bottom of the tank is tempered? I would be weary of drilling the bottom personally. IF it were me... I would do a Calfo style overflow, much better surface skimming and less obtrusive than a typical style overflow. Oh, and as far as where to drill the holes... drill the holes no closer to an edge that the diameter of the hole. IE if you are drilling a 1.5" hole, don't drill it any closer than 1.5" away from the edge of the glass.
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My 135RR Tank build

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