Size: 3.7L The Marina Betta Style Aquarium provides a no mess, no stress maintenance solution. Now there's no need to get the hands wet; disturb the Betta or disrupt the aquarium décor in order to perform routine water changes. Simply add clean water and the EZ care self-cleaning feature does the rest. By adding clean water, debris gets flushed to the bottom of the tank and then out to the reservoir located on the back. When the reservoir is filled; just remove, empty and replace -- no mess, no stress. The aquarium's small size takes up very little space and its chic design allows it to blend in nicely with a variety of household or office settings such as counters, desks, bookshelves or coffee tables.