---
product_id: 541255634
title: "FZONE Aquarium ATO System, QST2.0 Auto Top Off Controller for Tanks"
brand: "fzone"
price: "€ 129.20"
currency: EUR
in_stock: true
reviews_count: 13
category: "Fzone"
url: https://www.desertcart.sk/products/541255634-fzone-aquarium-ato-system-qst2-0-auto-top-off-controller
store_origin: SK
region: Slovakia
---

# 74 GPH micro pump flow rate 0.79 in optical sensor diameter QST 2.0 real-time overfill protection FZONE Aquarium ATO System, QST2.0 Auto Top Off Controller for Tanks

**Brand:** fzone
**Price:** € 129.20
**Availability:** ✅ In Stock

## Summary

> 💧 Keep your aquarium flawless—automate with precision and style!

## Quick Answers

- **What is this?** FZONE Aquarium ATO System, QST2.0 Auto Top Off Controller for Tanks by fzone
- **How much does it cost?** € 129.20 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/541255634-fzone-aquarium-ato-system-qst2-0-auto-top-off-controller)

## 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

- • **Smart Safety First:** QST 2.0 tech halts overfilling and alerts you instantly, protecting your aquatic ecosystem 24/7.
- • **Compact & Versatile Fit:** Slim 0.79-inch sensor fits rimmed, rimless, and sump tanks—perfect for any modern aquarium setup.
- • **Plug & Play Convenience:** Complete kit with magnets, check valve, and 6-foot tubing for effortless installation and peace of mind.
- • **Precision Water Level Control:** Dual optical sensors maintain water level within 0.6 cm for flawless aquarium balance.
- • **Ultra-Quiet, High-Performance Pump:** 74 gallons per hour flow with a 2-meter lift height ensures efficient, whisper-quiet operation.

## Overview

The FZONE Aquarium ATO QST2.0 Auto Top Off System is a cutting-edge solution for maintaining optimal water levels in both saltwater and freshwater tanks. Featuring dual optical sensors for precise monitoring, a quiet 74 GPH micro pump, and advanced overfill protection technology, it ensures your aquatic environment stays stable and safe. Compact design and included accessories make installation seamless, backed by a 2-year warranty and 24/7 support for worry-free ownership.

## Description

desertcart.com : FZONE Aquarium ATO System, QST2.0 Auto Top Off Controller for Tanks | Smart ATO system with precise controller for saltwater and freshwater aquariums, maintaining stable water levels : Pet Supplies

Review: Huge Improvement Over the Previous Version - I've used the previous FZONE ATO, and this new QST2.0 version is a massive improvement. The biggest feature for me is the overfill safety protection. It already saved me from what could have been a disaster. Something happened in my overflow box that prevented water from making it back to the return pump section of my sump. The sensor was still exposed and calling for water, but instead of continuously pumping and flooding my floor, the ATO went into flashing alarm mode and shut itself down. What a lifesaver... and a carpet saver! I also really like the updated controller design. The lights are easier to see, and the button makes it simple to temporarily turn the unit on or off when working around the tank or moving equipment. It's much more convenient than the previous version. I still sometimes unplug it out of habit because old reefing fears die hard, but my confidence in this unit is growing quickly. So far, this has been reliable, easy to use, and clearly designed with real-world reef tank issues in mind. If you're considering an ATO for a saltwater tank, this newer version is absolutely worth it. Kudos to FZONE for making a good product even better. 👍🐠🌊
Review: A Simple Upgrade That Makes a Big Difference - I can honestly say this ATO system has exceeded my expectations. I didn’t realize how much I needed an automatic top-off system until I installed this one. One of my favorite features is the sleek external controller. It gives me clear status indicators and easy controls without adding unnecessary lights or clutter inside the aquarium, keeping the display clean and distraction-free. Installation was quick and straightforward. For a cleaner, more finished appearance, I drilled a 3/8-inch hole in the back of my standby water reservoir to route both the water tubing and the DC pump cable. The result looks professional and keeps everything neatly hidden. Best of all, no more water lines from fluctuating water levels and no more manually topping off the tank every day. It’s one of those upgrades that quietly makes aquarium maintenance much easier. Thanks for a great product, FZONE!

## 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 | #28,370 in Pet Supplies ( See Top 100 in Pet Supplies ) #64 in Aquarium Water Pumps |
| Brand | FZONE |
| Brand Name | FZONE |
| Color | Blue2 |
| Customer Reviews | 3.9 out of 5 stars 448 Reviews |
| Flow Rate | 1.23 gpm |
| Included Components | prevent backflow |
| Item Dimensions L x W x H | 0.2"L x 0.1"W x 0.1"H |
| Item Highlight | Smart ATO system with precise controller for saltwater and freshwater aquariums, maintaining stable water levels |
| Item Weight | 0.4 kg |
| 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 |
| Number of Items | 1 |
| 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 Count |
| Voltage | 15 volts |

## Product Details

- **Brand:** FZONE
- **Color:** Blue2
- **Item Weight:** 0.4 kg
- **Material:** Polypropylene (PP)
- **Maximum Flow Rate:** 1.23 gpm
- **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

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Huge Improvement Over the Previous Version
*by E***W on September 4, 2026*

I've used the previous FZONE ATO, and this new QST2.0 version is a massive improvement. The biggest feature for me is the overfill safety protection. It already saved me from what could have been a disaster. Something happened in my overflow box that prevented water from making it back to the return pump section of my sump. The sensor was still exposed and calling for water, but instead of continuously pumping and flooding my floor, the ATO went into flashing alarm mode and shut itself down. What a lifesaver... and a carpet saver! I also really like the updated controller design. The lights are easier to see, and the button makes it simple to temporarily turn the unit on or off when working around the tank or moving equipment. It's much more convenient than the previous version. I still sometimes unplug it out of habit because old reefing fears die hard, but my confidence in this unit is growing quickly. So far, this has been reliable, easy to use, and clearly designed with real-world reef tank issues in mind. If you're considering an ATO for a saltwater tank, this newer version is absolutely worth it. Kudos to FZONE for making a good product even better. 👍🐠🌊

### ⭐⭐⭐⭐⭐ A Simple Upgrade That Makes a Big Difference
*by A***R on July 20, 2026*

I can honestly say this ATO system has exceeded my expectations. I didn’t realize how much I needed an automatic top-off system until I installed this one. One of my favorite features is the sleek external controller. It gives me clear status indicators and easy controls without adding unnecessary lights or clutter inside the aquarium, keeping the display clean and distraction-free. Installation was quick and straightforward. For a cleaner, more finished appearance, I drilled a 3/8-inch hole in the back of my standby water reservoir to route both the water tubing and the DC pump cable. The result looks professional and keeps everything neatly hidden. Best of all, no more water lines from fluctuating water levels and no more manually topping off the tank every day. It’s one of those upgrades that quietly makes aquarium maintenance much easier. Thanks for a great product, FZONE!

### ⭐ Stopped working
*by P***V on August 7, 2026*

Worked well for a week, went on vacation and when I came back it had stopped working and my aquarium water level was extremely low

## Frequently Bought Together

- FZONE ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium
- PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.sk/products/541255634-fzone-aquarium-ato-system-qst2-0-auto-top-off-controller](https://www.desertcart.sk/products/541255634-fzone-aquarium-ato-system-qst2-0-auto-top-off-controller)

---

*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-09-12*