what size can i fit?

From the Aqueon (formerly All-Glass) product list, there is no 5 foot aquariums. So, 48 1/2 L x 24 1/2 w x 25 h (120 gallon). You could have a custom tank built that would better fit your footprint.
 
There are some 5 foot tanks out there. Not sure if they're made by Perfecto or someone else. I also believe Glasscages.com sells 5 foot 120's & 150's.
 
My 165 is 60X 24X 27 but alas its custom.. Oceanic may have a 5 footer in there roster.. If it were me i would just get a custom 68X 24X however tall you want
 
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