JBJ 12 Gallon & 24 Gallon Nano-Cube Replacement Cooling Fan JBJ 12 Gallon Compact Fluorescent Nano Cube, JBJ 12 Gallon LED Nano Cube, JBJ 24 Gallon LED Nano Cube & JBJ 24 Gallon Compact Fluorescent Nano Cube Replacement Cooling Fan For the old style compact fluorescent version only. Will NOT work with the new style all-LED version.