Fiji Cube Advanced Hang On Back Refugium Box PRO SERIES- MediumFiji Cube Hang On Refugium Box is a great option for growing beneficial algae to help with nutrient control in your tank and for harboring microfauna. The refugium box comes with a silent efficient pump and a unique baffle system. This design prevents the substrate and the inhabitants from being disturbed while providing enough flow to prevent stagnant zones. The refugium also provides an excellent environment to cultivate small organisms such as