The XK-200 , XK- 250 is simple and elegant, with a classic design  This square aquarium combines a filtration system and an energy-saving lighting system. All corners are made of high quality engineering plastic materials. Switch Waterproof Cap is your best choice for 24 hours. Crystal clear Security guard. The top filter with replaceable filter material keeps your water quality always clean. Biochemical filtration system and energy saving lighting system in one Energy-saving and environmentally friendly high-brightness LED lights can be turned on or off whenever you want without affecting the normal operation of the biochemical filtration system. Integrated filtration, oxygen and lighting systems allow your fish to enjoy more room for activity. Meet your simple and fashionable taste.