Tunze 255603 | Osmolator 3 Nano Auto Top Off | Aquarium Water Level Controller

Maintain perfect water levels automatically with the Tunze Osmolator 3 Nano Auto Top Off! Designed for nano and mid-size aquariums, this compact ATO uses a precision optical sensor and reliable dosing pump to keep your salinity stable. Ideal for tanks up to 66 gallons, it’s easy to install, safe, and efficient.

• Precision optical sensor for consistent water levels
• Low-voltage, high-performance dosing pump
• Easy and secure magnetic mounting system
• Suitable for aquariums up to 66 gallons
• Compact design ideal for nano tanks and sumps

More Information

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Frequently Asked Questions

• Does this include a pump? Yes, it includes a dosing pump and tubing.
• Can it be used in saltwater tanks? Yes, it works for both freshwater and saltwater systems.
• Is the sensor reliable? The optical sensor provides precise and consistent level detection.
• Does it prevent overfilling? Yes, the controller includes built-in safety features.
• How is it mounted? It attaches easily using the included magnetic mount.