Do you know the manufacturer as tempered glass will hold more water than non tempered glass tempered glass tends to be thinner than non tempered glass. You would have to contact the manufacturer. If it holds for a week then you should be good to go I have had smaller tanks that were made from tempered glass. Or do as Fitopharmer said nice level spot it can be outside but that would depend where you live in the Peg as to weather it goes legs or not. LOL My brother just puts anything he does not want anymore out to the back lane and by morning its gone just like magic.
Bill