I have a 48 and use it just for the backyard. I think it is the perfect size. Something to think about, while the tank size is 48" long, the lower grate is just 36" long. Grate space is lost at each end and on the 36 I'm thinking real estate would be sadly lacking.
Now mine is one with the rounded ends and the newer ones may be set up a bit different, but I'm sure there will still be some "grate loss" at each end.
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