I have one of these stands. The measurements for the top frame and bottom frame are not the same. The top frame is longer and deeper and designed to hold a 55 gallon aquarium. The bottom frame measures 46 1/2 long by 11 3/8 deep and is designed to hold two 10 gallon aquariums. Note that the depth of 11 3/8 is less than many standard aquarium widths of 12.5, 12.8, etc.
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