Fzone ATO380 Aquarium Auto Top-Off Water Refilling System
Fzone ATO380 Aquarium Auto Top-Off Water Refilling System
Fzone ATO380 Aquarium Automatic Top-Off Refilling System
Keep your fish tank water level perfectly stable with the Fzone ATO380 Auto Top-Off Refilling System. Designed for freshwater and saltwater aquariums alike, this compact automatic water refill unit monitors your tank around the clock and quietly replenishes evaporated water — so your aquatic environment stays consistently healthy without constant manual intervention.
Precision Water-Level Control
- Dual Optical Sensors (<1 mm precision): Two high-accuracy optical sensors monitor water level in real time, triggering the pump only when needed — no floats, no mechanical wear.
- Ultra-Stable Water Level: Keeps water fluctuation under 0.6 cm, protecting sensitive corals, fish, and invertebrates from salinity or parameter swings caused by evaporation.
- Auto-Off Safety: The system automatically shuts off once the target water level is reached, preventing overfilling and protecting your equipment.
- Nano-Sized Design: At just 0.7 inches (ATO sensor unit), this is one of the most compact auto top-off systems available — fits easily in nano tanks and tight sump areas.
- Multiple Power Options: Available in 4 power (W) configurations to suit tanks of varying sizes and refill demands.
- Durable Metal Construction: Built to last with quality metal components, ensuring long-term reliability in humid aquarium environments.
- 12V Operation: Low-voltage 12V system for safe, energy-efficient performance near water.
Why Use an Auto Top-Off System?
Water evaporates from aquariums daily, and even small fluctuations in water level can affect salinity (in reef tanks) or stress your fish. The Fzone ATO380 takes the guesswork out of water maintenance by automatically topping off your tank at the ideal level — giving you peace of mind and more time to enjoy your aquarium. Learn more about proper aquarium water management from the USGS Water Science School.
What's in the Box
- Fzone ATO380 Auto Top-Off Controller Unit
- Dual Optical Water-Level Sensors
- Micro Water Pump
- Mounting Hardware & Accessories
- 12V Power Supply
Ideal For
- Reef & saltwater aquariums requiring stable salinity
- Freshwater planted tanks
- Nano tanks & desktop aquariums
- Sumps and refugiums
- Any aquarist who wants hands-free water-level management
Also check out these compatible aquarium accessories: Aquarium Filter Water Pipe Hose Bracket & Fixing Clamp, XY-2822/2821 Fish Tank Air Pump & Aquarium Filter Sponge, and HW-602B/603B Aquarium External Canister Filter Inlet/Outlet Tube.
Frequently Asked Questions
Q: What does the Fzone ATO380 Auto Top-Off Refilling System do for my aquarium?
A: The Fzone ATO380 automatically monitors your aquarium's water level using dual precision optical sensors (<1 mm accuracy) and refills evaporated water via a micro pump. It keeps water-level fluctuation under 0.6 cm and shuts off automatically once the target level is reached — maintaining a consistently stable environment for your fish, corals, and invertebrates without manual topping off.
Q: What size aquarium is the ATO380 suitable for?
A: The ATO380 is available in 4 different power (W) configurations, making it adaptable for nano tanks, standard home aquariums, and larger systems with sumps. Its ultra-compact 0.7-inch sensor unit fits even the tightest spaces, including nano aquariums and small sumps.
Q: Is the Fzone ATO380 safe to use unattended?
A: Yes. The system's automatic shut-off feature cuts power to the pump as soon as the water level reaches the preset target, preventing overfilling. The low-voltage 12V design adds an extra layer of safety around water. The optical sensors have no moving parts, minimizing the risk of mechanical failure common with float-based systems.
Q: What materials is the ATO380 made from?
A: The Fzone ATO380 is constructed with durable metal components, built to withstand the humid conditions typical of aquarium environments for long-lasting reliability.