On my 150 gal my return is 1" and my overflow is 2". I'm no expert but I think you might be able to get away with using one of the holes as a return and the other two as overflows.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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