There's no definitive answer to this question since there are a lot of different types of aquariums and hamsters can have different reactions to them. Some people have had success using regular, unfiltered aquariums while others recommend using a filtered aquarium specifically designed for small animals. The most important thing when setting up an aquarium for a hamster is to make sure that it's escape-proof. Hamsters are very curious creatures and they're likely to try to climb out of an unsecured tank, so be sure to use a tight-fitting lid and place it in a safe spot where the hamster can't get into trouble.