The Aqueon OptiBright MAX LED Lighting System is a high quality, customizable aquatic light fixture featuring 8 preset colors with unlimited color combinations. Ideal for helping to maintain and grow freshwater plants and sensitive corals. The unit has a 24-hour timer that allows you automatic 30 minute ramp times to accurately and gradually replicate the natural sunsets and sunrises that your aquarium inhabitants are used to in the wild. The Aqueon OptiBright MAX LED Lighting System comes with a handheld controller and a three speed color scroll that allows you to independently control the white, blue and RGB LED lights with adjustments in 10% increments as to not stress out tank inhabitants with drastic visual changes. Suitable for freshwater and saltwater tanks between 18″ and 24″ in size.