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Just would like to state that a regular 40 gal (48x12x17) & a 55 gal (48x12x21) have exactly the same floor space of 4 square feet, a 55 gal is just taller. A 40 Gal (36x18x17) Breeder has 4.5 square feet of floor area & is the better choice, as Aleena mentioned.