---
product_id: 541255634
title: "Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium"
brand: "fzone"
price: "€ 127.39"
currency: EUR
in_stock: true
reviews_count: 13
category: "Fzone"
url: https://www.desertcart.be/products/541255634-aquarium-ato-with-controller-qst2-0-auto-top-off-system
store_origin: BE
region: Belgium
---

# 74 GPH ultra-quiet pump 0.79 in optical sensor precision QST 2.0 real-time overfill safety Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium

**Brand:** fzone
**Price:** € 127.39
**Availability:** ✅ In Stock

## Summary

> 💦 Keep your tank flawless, even when life calls you away!

## Quick Answers

- **What is this?** Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium by fzone
- **How much does it cost?** € 127.39 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/541255634-aquarium-ato-with-controller-qst2-0-auto-top-off-system)

## Best For

- fzone enthusiasts

## Why This Product

- Trusted fzone brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Whisper-Quiet Pump Power:** 74 gallons per hour flow with a 2-meter lift height, engineered for silent, efficient operation that extends pump life.
- • **Smart Safety, Zero Worries:** Advanced QST 2.0 tech halts overfilling and alerts you instantly, protecting your aquatic ecosystem 24/7.
- • **Compact Sensor, Big Accuracy:** Tiny 0.79-inch optical sensor fits any tank style, delivering pinpoint water level monitoring with just 0.6 cm variance.
- • **Effortless Water Level Mastery:** Set it and forget it—precise auto top-off keeps your aquarium perfectly balanced, even when you're away.
- • **Plug & Play with Premium Accessories:** Includes strong magnets, check valve, and 6-foot tubing for fast, hassle-free installation and reliable performance.

## Overview

The FZONE Aquarium ATO with Controller QST2.0 is a cutting-edge auto top-off system designed for both saltwater and freshwater tanks. Featuring a compact optical sensor for ultra-precise water level detection, a whisper-quiet 74 GPH pump with 2-meter lift, and advanced QST 2.0 safety technology to prevent overfill and sensor errors. Complete with premium installation accessories and backed by a 2-year warranty plus 24/7 support, it’s the ultimate hassle-free solution for maintaining stable aquarium water levels—perfect for busy professionals who demand reliability and peace of mind.

## Description

Fzone studio Fzone started in 2018 as a neccesity to find aquarium products that were from the best quality while still being beautiful and accesible. It started as a hobby, but we noticed the expenses and realized that the aquarium market was in need of help. We appreciate all the support that we’ve received from our customers. Thank your for supporting us, and we hope you continue around to grow with us. Fzone started in 2018 as a neccesity to find aquarium products that were from the best quality while still being beautiful and accesible. It started as a hobby, but we noticed the expenses and realized that the aquarium market was in need of help. We appreciate all the support that we’ve received from our customers. Thank your for supporting us, and we hope you continue around to grow with us. FZONE ato FZONE light FZONE filter FZONE wave maker FZONE Aquarium Algae Scraper

Review: Another great FZone product! - Perfect ATO System - Set It and Forget It! The FZONE Aquarium ATO with Controller has been one of the best upgrades I’ve made to my tank. Setup was incredibly straightforward, and the controller feels solid, accurate, and reliable. The optical sensor detects water levels perfectly, and the pump tops off smoothly without any noise or delay. I love that I no longer have to worry about daily evaporation and my water level stays stable, and my fish are happier than ever. The safety features give great peace of mind, and the build quality is way better than I expected for the price. If you’re looking for a dependable, hassle-free automatic top-off system, the FZONE ATO is absolutely worth it. 100% recommend!
Review: Great cost effective ATO - So far I have been very impressed with this ATO. Operation is whisper quiet and the controller makes it easy to disable for water changes and the sensor is accurate. I can attest to it's ability to stop automatically if pump is active for too long after my sea hare went across the tank's overflow weir when I was not far away. I heard the alarm and checked to find the weir partially blocked and the return pump chamber low. Once the hare had moved on, I just pressed the button on the controller and it reset it self. On another note, when people complain about overflows, I wonder if the sensor just needs to be cleaned of salt/mineral buildup.

## Features

- Upgraded 2.0 ATO System：The 2.0 ATO system ensures efficient daily water level maintenance for saltwater and freshwater tanks, making it ideal for use during trips or holidays. The upgraded interface allows you to easily start, pause, or resume the system with the FZ button
- Compact and Versatile Design：The optical sensor measures just 0.79 inches in diameter, making it suitable for rimmed, rimless, or sump tanks. Dual sensors, spaced 0.1 cm apart, monitor water levels with precision, maintaining a difference of only 0.6 cm. Recommended for tanks with wave fluctuations under 1 cm.
- Enhanced Safety Features：QST 2.0 technology provides real-time overfill protection. The system stops the pump and triggers an alarm if refilling exceeds 3 times the preset limit. It also detects sensor issues and low reservoir levels for added safety.
- Quiet Micro Pump：The compact pump fits tanks with neck sizes over 1.97 inches, offering a flow rate of 74 gallons per hour and a lift height of up to 2 meters. Optimized operation reduces unnecessary activations, extending pump life.
- Complete Accessories Included：The set includes strong magnets (compatible with tank walls up to 0.78 inches thick), a check valve to prevent backflow, and a 6-foot (180 cm) tube for quick installation.
- 2-Year Warranty & 24/7 Customer Support:FZONE provides a comprehensive 2-year warranty along with 24/7 online customer support. If you have any questions or encounter any issues with your product, our team is always available to assist you—anytime, anywhere.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C68N3WK9 |
| Best Sellers Rank | #22,939 in Pet Supplies ( See Top 100 in Pet Supplies ) #72 in Aquarium Water Pumps |
| Brand | FZONE |
| Brand Name | FZONE |
| Color | Blue2 |
| Customer Reviews | 4.0 out of 5 stars 403 Reviews |
| Flow Rate | 1.23 Gallons Per Minute |
| Included Components | prevent backflow |
| Item Dimensions L x W x H | 0.2"L x 0.1"W x 0.1"H |
| Item Weight | 0.4 Kilograms |
| Manufacturer | FZONE |
| Manufacturer Part Number | ATO-580P |
| Manufacturer Warranty Description | Manufacturer warranty for one year from date of purchase |
| Material | Polypropylene (PP) |
| Material Type | Polypropylene (PP) |
| Maximum Lifting Height | 2 Meters |
| Model Number | FZ-580P |
| Power Source | Corded Electric |
| Product Dimensions | 0.2"L x 0.1"W x 0.1"H |
| Product Style | Auto |
| Specific Uses For Product | Aquarium |
| Style | Auto |
| Unit Count | 1.0 Count |
| Voltage | 15 Volts |

## Product Details

- **Brand:** FZONE
- **Color:** Blue2
- **Item Weight:** 0.4 Kilograms
- **Material:** Polypropylene (PP)
- **Maximum Flow Rate:** 1.23 Gallons Per Minute
- **Maximum Lifting Height:** 2 Meters
- **Power Source:** Corded Electric
- **Product Dimensions:** 0.2"L x 0.1"W x 0.1"H
- **Style:** Auto
- **Voltage:** 15 Volts

## Images

![Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium - Image 1](https://m.media-amazon.com/images/I/51LdVhZJ0ML.jpg)
![Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium - Image 2](https://m.media-amazon.com/images/I/61-alUmNoWL.jpg)
![Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium - Image 3](https://m.media-amazon.com/images/I/61mWx1T2hGL.jpg)
![Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium - Image 4](https://m.media-amazon.com/images/I/61NoiLfKB8L.jpg)
![Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium - Image 5](https://m.media-amazon.com/images/I/71aVOgelolL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Another great FZone product!
*by A***R on December 12, 2025*

Perfect ATO System - Set It and Forget It! The FZONE Aquarium ATO with Controller has been one of the best upgrades I’ve made to my tank. Setup was incredibly straightforward, and the controller feels solid, accurate, and reliable. The optical sensor detects water levels perfectly, and the pump tops off smoothly without any noise or delay. I love that I no longer have to worry about daily evaporation and my water level stays stable, and my fish are happier than ever. The safety features give great peace of mind, and the build quality is way better than I expected for the price. If you’re looking for a dependable, hassle-free automatic top-off system, the FZONE ATO is absolutely worth it. 100% recommend!

### ⭐⭐⭐⭐⭐ Great cost effective ATO
*by B***Z on May 30, 2026*

So far I have been very impressed with this ATO. Operation is whisper quiet and the controller makes it easy to disable for water changes and the sensor is accurate. I can attest to it's ability to stop automatically if pump is active for too long after my sea hare went across the tank's overflow weir when I was not far away. I heard the alarm and checked to find the weir partially blocked and the return pump chamber low. Once the hare had moved on, I just pressed the button on the controller and it reset it self. On another note, when people complain about overflows, I wonder if the sensor just needs to be cleaned of salt/mineral buildup.

### ⭐ Created a huge mess
*by S***S on December 31, 2024*

This seemed to be working fairly well until it went crazy and dumped 5 gallons of freshwater into my tank. That led to an overflow in the sump and I suddenly had a lake in my office. Fortunately the tank is new, so there were no corals or livestock in the tank. I will be going back to doing manual top offs. I recommend that you stay far away from this.

## Frequently Bought Together

- FZONE ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium
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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-06-10*