Actually an aquarium won't work out very well because when a sulcata can see through the walls of his or her enclosure he/she will spend all it's time trying to get out. They'll walk around & around which would be good exercise but the dangerous thing about it is they'll try to climb out. When they do that they can flip over on their backs & you could come home to find them either in bad shape or not breathing.
Tortoise tables are a better way to go with youngsters who need to live indoors.
Here's a URL for instructions on how to build them:
http://www.sulcstatn.addr.com/housing.html
If you can't build one of these then a large Rubbermaid storage box or a plastic wading pool for kids.. something that they can't see through would be better than using a glass aquarium.
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PHRatz