{"product_id":"fzone-ato380-aquarium-auto-top-off-refilling-system","title":"Fzone ATO380 Aquarium Auto Top-Off Water Refilling System","description":"\n\u003ch2\u003eFzone ATO380 Aquarium Automatic Top-Off Refilling System\u003c\/h2\u003e\n\u003cp\u003eKeep your fish tank water level perfectly stable with the \u003cstrong\u003eFzone ATO380 Auto Top-Off Refilling System\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch3\u003ePrecision Water-Level Control\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Optical Sensors (\u0026lt;1 mm precision):\u003c\/strong\u003e Two high-accuracy optical sensors monitor water level in real time, triggering the pump only when needed — no floats, no mechanical wear.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Stable Water Level:\u003c\/strong\u003e Keeps water fluctuation under 0.6 cm, protecting sensitive corals, fish, and invertebrates from salinity or parameter swings caused by evaporation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAuto-Off Safety:\u003c\/strong\u003e The system automatically shuts off once the target water level is reached, preventing overfilling and protecting your equipment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNano-Sized Design:\u003c\/strong\u003e 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.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMultiple Power Options:\u003c\/strong\u003e Available in 4 power (W) configurations to suit tanks of varying sizes and refill demands.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Metal Construction:\u003c\/strong\u003e Built to last with quality metal components, ensuring long-term reliability in humid aquarium environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12V Operation:\u003c\/strong\u003e Low-voltage 12V system for safe, energy-efficient performance near water.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Use an Auto Top-Off System?\u003c\/h3\u003e\n\u003cp\u003eWater 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eFzone ATO380 Auto Top-Off Controller Unit\u003c\/li\u003e\n  \u003cli\u003eDual Optical Water-Level Sensors\u003c\/li\u003e\n  \u003cli\u003eMicro Water Pump\u003c\/li\u003e\n  \u003cli\u003eMounting Hardware \u0026amp; Accessories\u003c\/li\u003e\n  \u003cli\u003e12V Power Supply\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eReef \u0026amp; saltwater aquariums requiring stable salinity\u003c\/li\u003e\n  \u003cli\u003eFreshwater planted tanks\u003c\/li\u003e\n  \u003cli\u003eNano tanks \u0026amp; desktop aquariums\u003c\/li\u003e\n  \u003cli\u003eSumps and refugiums\u003c\/li\u003e\n  \u003cli\u003eAny aquarist who wants hands-free water-level management\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAlso check out these compatible aquarium accessories: \u003ca href=\"\/products\/4pcs-aquarium-filter-water-pipe-filter-hose-bracket-water-pipe-fixing-clamp-hose-moving-clamp\"\u003eAquarium Filter Water Pipe Hose Bracket \u0026amp; Fixing Clamp\u003c\/a\u003e, \u003ca href=\"\/products\/2pcs-for-xy-2822-2821-filter-fish-tank-air-pump-filter-12-6cm-fish-tank-filter-supplies-aquarium-filter-sponge-1\"\u003eXY-2822\/2821 Fish Tank Air Pump \u0026amp; Aquarium Filter Sponge\u003c\/a\u003e, and \u003ca href=\"\/products\/hw-602b-hw-603b-inlet-outlet-tube-pipe-parts-aquarium-external-canister-filter\"\u003eHW-602B\/603B Aquarium External Canister Filter Inlet\/Outlet Tube\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does the Fzone ATO380 Auto Top-Off Refilling System do for my aquarium?\u003c\/h4\u003e\n\u003cp\u003eA: The Fzone ATO380 automatically monitors your aquarium's water level using dual precision optical sensors (\u0026lt;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.\u003c\/p\u003e\n\u003ch4\u003eQ: What size aquarium is the ATO380 suitable for?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Is the Fzone ATO380 safe to use unattended?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: What materials is the ATO380 made from?\u003c\/h4\u003e\n\u003cp\u003eA: The Fzone ATO380 is constructed with durable metal components, built to withstand the humid conditions typical of aquarium environments for long-lasting reliability.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the Fzone ATO380 Auto Top-Off Refilling System do for my aquarium?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Fzone ATO380 automatically monitors your aquarium's water level using dual precision optical sensors (\u0026lt;1 mm accuracy) and refills evaporated water via a micro pump. 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