JBJ Nano Glo LED Refugium Light (w/ magnet) Note: This version comes with a MAGNET. Nano Glo LED Refugium Light can upgrade an existing JBJ Nano Cube into an In-Tank Refugium. Boasts 4 powerful high intensity LEDs that evenly distribute light for macro algae, and aid in the removal of unwanted phosphates and nitrates It attaches to the rear wall of the aquarium with the included large magnet. The new higher output design still creates minimal heat and lasts an amazing 40,000 hours