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Yes do this.. if you don;t mine losing 6" off your tank silicone a 24X23 sheet of plexy with teeth on the top to make a overflow box in the end.. then put two 1.5" bulkheads on the bottom so you can go with two durso's. even if you only need 1 you can plug the other while you are not using it. or leave it a little taller for a "emergency spill" if the main one fails.
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This is
exactly what I did but I lost 7" because I had euro bracing to get my drain pipes through the overflow and edge of bracing. I like my three sided tank but wish it was longer. I really miss the 7". I would do it on a 6' 180gal or your size tank but not a 4' 120gal... gives you only 41"