Introducing the Flipper ATO (Auto Top-Off) is a state-of-the-art water storage reservoir system that ensures your aquarium is always at the optimal water level. This innovative device helps to prevent the stress and damage that can be caused by fluctuations in water level, giving you peace of mind knowing that your aquatic pets are safe and happy. The ATO system uses advanced sensors to detect the water level in your aquarium, ensuring that it remains consistent and stable. The Flipper is made from crystal-clear acrylic, making it easy to see the water level and monitor the system's performance. Made from high-quality materials, the Flipper ATO is built to last and withstand the rigors of daily use. Flipper ATO is an essential tool for any aquarium owner looking to maintain a stable water level and keep their aquatic pets healthy and happy. Designed specifically for small aquariums, the Flipper ATO has a compact and space-saving design that won't take up too much room in your tank setup. Holds Approximately .55 Gal / 2.1 Liters (Reverse osmosis or distilled water recommended).