Abstract: A fiber optic illumination system and method is utilized to provide illumination for decorative fixtures and objects situated in an aquarium, terrarium, and the like. An external, high-intensity lamp, powered by household electricity, provides the light source for a flexible, fiber optic bundle that is insulated and waterproofed. A motorized, interchangeable color wheel, located between the lamp and the fiber optic bundle, modifies the light source to create colored light. Once the light bundle is inserted into the water tank, the fiber optic strands are separated and directed to a plurality of interchangeable, transparent and translucent fixtures and objects to decorate the aquarium.