The Fluval Edge is a unique and elegant design that is sure to turn heads. This all glass aquarium provides a unique look with a contemporary setting. The partially sealed top reduces evaporation for less maintenance and a large, hidden aperture allows oxygen exchange to keep fish healthy. The light fixture creates a bright, directional light source for a beautiful 'shimmer' effect across your entire aquatic scene. It also retracts, allowing access to a 7 x 4 3/4 opening to maintenance the aquarium. The light fixture features a perforated, removable cover that effectively dissipates lamp heat, avoids moisture and allows easy access to the filter's lift out media trays. Fluval EDGE comes complete with a powerful and efficient 3 stage filter which remains completely hidden, preserving the striking aquarium design. Due to the unique design of the aquarium it is highly recommended that you get the Fluval EDGE net, gravel cleaner, heater, and algae magnet cleaner. The 6 gallon measures 16.875 x 10.25 x 8.75 and the 12 gallon measures 16.875 x 10.25 x 17.5.The original 6 gallon aquarium features two bright 10 watt halogen bulbs.-->The LED aquarium features efficient 7600K high luminosity LEDs that are suitable for aquatic plants and a 3-mode switch that allows either, daylight (white and blue LEDs on), nightlight (only blue LEDs on), or all LEDs off. The 6 gallon contains 21 LEDs. The 12 gallon contains 42 LEDs.