Use a rectangular hole the size of a floor Heat/AC vent.
@- 2 reasons - accommodates piping easier than round holes & can be covered by a grate if you ever have to, providing you buy it.
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250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.
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