Aquarium Auto Top-Off System for Stable Water Levels in Freshwater and Reef Tanks with Dual Sensors

Keep your aquarium’s water level steady between maintenance sessions with an automatic top-off system built for freshwater and reef setups. N-Fill Smart ATO monitors the same water line with two float sensors, then adds water when either sensor detects a low level.

The compact controller, quiet pump and included siphon-breaker hardware support dependable day-to-day operation, while clear controls make feeding, priming and maintenance easy to manage.

Key Features

• Dual float sensors monitor one water line independently, so either sensor can trigger a refill if the level drops.
• The controller pauses filling after about 90 seconds of continuous pump operation, sounding an alarm and lighting the Status LED to help limit over-filling.
• Manual, 30-minute Pause and 24-hour Stop controls let you prime the pump, pause during feeding or disable automatic filling for major maintenance.
• A quiet DC pump delivers up to 180 L/h with a maximum head of 160 cm, fitting common nano and mid-size aquarium reservoirs.
• The included siphon breaker and tubing organizer help keep the refill outlet above the aquarium surface and route tubing neatly along the rim.
• The system supports both freshwater and saltwater aquariums, including planted tanks and reef aquariums.

Specifications

• Tank compatibility: freshwater and saltwater aquariums
• Power input: AC 100–240 V, 50/60 Hz
• Power adapter output: DC 12 V, 1 A; UL listed
• Maximum pump head: 160 cm (63 in)
• Maximum flow rate: 180 L/h (47.6 GPH)
• Maximum glass thickness: up to 15 mm (0.6 in)
• Sensor adjustment: standard arm up to 10 cm (4 in) below rim
• Optional extension reach: approximately 25 cm (10 in) total below rim
• Control modes: manual fill, 30-minute pause, 24-hour stop
• Tubing length: 2 m (6.5 ft)
• Included: controller, dual float sensors, N-Neon tubing organizer, submersible pump, tubing, siphon breaker and power adapter
• Power adapter note: supplied unit uses a US plug; connector is 5.5 × 2.1 mm (5521)
• Warranty: 1-year limited warranty

Set up N-Fill Smart ATO to reduce daily top-off chores while keeping your aquarium’s waterline consistent. Check that the siphon breaker and refill outlet stay above their required waterlines, then use the status lights and simple buttons to keep routine care under control.