Fiji Cube 108 Gallon INT Middle Overflow Rimless TankInternal (INT) Middle Shallow Rimless Aquarium The Internal overflow tank is a popular tank choice in the reef keeping hobby. Fiji Cube launches a series of ultra clear low iron glass aquariums with Fiji Cubes internal overflow design. The attractiveness and uniqueness of the Fiji Cube glass aquarium tanks stand out with its slim dual weir internal overflow design and extra thick glass selection, achieving the best in class tanks in both design and