Impressive effect - able to eliminate bacteria and algae within 30 minutes, very effective and time saving. The sterilization lamp should not come into direct contact with fish. Easy to use - Press the button to control the lighting, making the cleaning process simpler than ever before. Excellent silica glass - excellent transparency and ultra durable service life. The powerful ultraviolet radiation greatly improves the speed and intensity of conventional sterilization, and provides better water conditions. Attention: Please measure the size of your aquarium and compare it with the size of our product before purchasing. Note:This product can emit effective ultraviolet radiation and has certain harmful effects on the human body. Please do not observe with the naked eye as direct contact can damage people's eyes and skin,Direct contact with living organisms is prohibited. It is recommended to turn on the lights for about 2 hours each time, and it is prohibited to continuously turn on the lights for more than 6 hours.