Smart ATO Nano - Auto Top Off Kit

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$109.99 $109.99

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The perfect All-In-One, Plug-and-Play Auto Top-Off solution for aquariums under 50 gallons


As fresh water evaporates from your saltwater aquarium, the salt that is left behind begins to build in concentration. Auto top off systems help to restore osmotic balance in your aquarium by refilling the fresh water lost to evaporation. This is especially important in smaller aquarium systems, where evaporation can lead to salt concentration fluctuation more quickly and harm your livestock.


The AutoAqua Smart ATO Nano Kit will automatically monitor and refill evaporated water in small tanks, preventing dangerous osmotic fluctuations and protecting your livestock. With integrated Quick Security Technology, a durable prefilter, simple installation, and a silent DC diaphragm pump; the Smart ATO Nano has everything you need for an effective and secure automatic top off system.

  • Ideal for tanks under 50 gallons
  • Hang-On-Back, compact design
  • Assembles or disassembles in minutes-- no tools required
  • Quick Security Technology to prevent overflowing or pump running dry
  • Flexible installation on rimmed and rimless aquariums
  • Silent, built-in DC diaphragm pump
  • Reusable prefilter to remove dirt and contaminants from ATO reservoir


How It Works

The AutoAqua Smart ATO Nano kit includes a main controller with built-in DC diaphragm pump that mounts effortlessly to the wall of your aquarium or sump. Its adjoining optical water level sensor can be magnetically mounted anywhere within the tank, while any excess sensor cable length can be hidden inside the storage space located within the controller body, allowing for a clean installation. The controller cover has two holes for affixing the inlet tubing for more flexible installation. The kit also includes a Prefilter designed to remove contaminants from your water reservoir prior to topping off your main tank or sump. Its crystal-clear body allows users to check its cleanness quickly, and it can be quickly disassembled for easy maintenance. In addition, the o-ring inside it enables it to work well under high pressure. Installing the Smart ATO Nano on an aquarium is straightforward and effortless-- Simply hang it on the wall of the tank or sump, connect the included tubing, and plug in the power supply.


Smart ATO Nano Installation Diagram


  • Power Input: 100-240 VAC, 50-60 Hz
  • Diaphragm Pump:
    • Suction Head: 6.5 ft
    • Flow Rate: 7.9 gph
  • Anti-Siphon Pressure: 2 ft
  • Mounting Thickness:
    • Sensor: Max. 1/2" (12.7 mm)
    • Holder: 0.12-0.39" (3-10 mm)
  • Cable Length:
    • Sensor: 1.5 ft
    • Power Supply: 6 ft
  • Tubing:
    • Length: 6.5 ft
    • ID: 5/32" (4 mm)
    • OD: 1/4" (6.4 mm)


What's Included?

1x Smart ATO Nano w/ Adjustable Sensor

1x Prefilter

1x Universal Power Adapter

1x Anti-Siphon Valve

6.5 feet of Tubing


More Information
UPC 4714041212341
Max Tank Thickness 3/8 in., 1/2 in.
Included Mounting Magnetic, Hang On/Bracket
Control Type Preset Plug & Play (No Controls)
Pump Included Yes
Pump Model AutoAqua Smart ATO Nano DC Diaphragm Pump
Flow Rate 7.9 GPH
Tubing Length 6.5 Feet
Power Type DC
Warranty 1 year
Additional Notes Mounting Thickness (Sensor): Max. 1/2" (12.7 mm)
Mounting Thickness (Holder): 0.12-0.39" (3-10 mm)
Water Level Detection Optical Sensor
Safety Features Overflow Timer, Run-Dry Protection, Includes Anti-Siphon Valve
Max Head Height 5 -10 Feet
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