This small, almost silent, air pump is great for nano tanks or for adding an air stone to an existing larger tank. It runs via USB power, which means it's also great in a power outage situation with a battery pack back up used for cell phones.

In our testing, the pump uses 1/3 of a watt of power under load. With the carabiner clip, you can also hang this air pump from above your aquarium - eliminating the need for a check valve. Or you can hang it in a car for a long trip to an event or fish store. Overall, these little pumps are extremely versatile.