Aquarium Auto Top-Off System

Spend More Time Enjoying Your Aquarium

Keep everyday evaporation from becoming another manual chore. The FZONE aquarium auto top-off system monitors water levels with dual optical sensors and activates the included refill pump when a top-up is needed, helping you maintain a more consistent water level while enjoying your aquascape.

Designed for freshwater, marine, and reef setups, the compact sensor mounts magnetically for a tidy installation. Choose Green or Blue to suit your setup.

Practical Water-Level Control

• Dual optical sensors: Monitor low and high water levels to control automatic refilling.
• Managed refill cycles: Extended-Filling Time Technology (EFTT) and Anti-Fluctuation Technology (AFT) help manage filling time and reduce unnecessary pump starts.
• Safety monitoring: QST 2.0 control technology helps detect operating issues, with pump shutoff and visual alerts for abnormal filling, an empty reservoir, or a malfunction.
• Compact magnetic mount: Supports aquarium walls up to approximately 0.78 inch (20 mm) thick.
• Flexible setup: Suitable for many nano, rimmed, rimless, and sump aquarium arrangements; check mounting clearance before installation.

Included in the Kit

ATO controller, DC refill pump, universal tube holder, water check valve, power adapter, approximately 6.5 feet of PU tubing, and user manual.

Product Details

• Color options: Green or Blue
• Maximum pump flow: up to 74 GPH
• Maximum pump lift: 6.56 feet (2 meters)
• Power adapter input: AC 100–240V
• Power adapter output: DC 12V/1A
• Use: replacing water lost through evaporation in freshwater and saltwater aquariums

Setup & care: Follow the included installation and calibration instructions. Keep the refill reservoir adequately filled, position the refill tube above the aquarium’s maximum water level, and install the check valve in the correct direction to reduce backflow and siphoning risk. Inspect and clean the sensors, pump, and tubing regularly. Automatic top-off does not replace routine aquarium monitoring.