Classic Disney Mickey Mouse 1.5 Gallon Aquarium Kit. The small size lends itself to small and few fish, which is perfect for the non-experienced aquarist. 1.5 gallon tank measures 8.5’’ L x 6’’ W x 9.5’’H. Kit contains a 1.5 gallon tank, a cover, colorful background, fun stickers, and an internal filter. For Freshwater fish: the tank is perfectly sized for a betta.