proper sump size?........

You want to put the largest sump you can fit in the stand. A 55 or 75 gallon tank would probably fit nicely under there -- depending on how much height you have to work with.
 
Half the tank volume is a good rule of thumb. Biff hit it on the head though "as big as you can fit." You can go to small you can never go to big.
 
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