It's even possible for rats to get a foot caught while climbing the sides of the cage, although this is rare. Aquariums need to be quite large for good ventilation. The best thing about a large aquarium is that you can often leave the top off, or just have a partial top so your rats can come out on the top to interact with you. They usually won't try to jump off, and they can't climb down the glass like they can on a wire cage. It can be difficult to find good rat cages for sale.
Some ferret cages can work for adult rats, but smaller rats can usually get through the bars.
Rabbit cages can work, but they usually have wire bottom floors, which isn't recommended for rats. See if the wire floor can be removed. Most large commercial cages are quite expensive, although if they are well made, they can last for many years and therefore can be a good investment. However, it is also fairly easy to make your own cage and much less expensive. I will be posting some plans.