Advanced Dissolved Oxygen Monitoring for Serious Aquarists

The HYDROS Control X3 DO Dissolved Oxygen Monitor is the first HYDROS controller purpose-built for continuous dissolved oxygen (DO) monitoring, giving reef keepers, freshwater hobbyists, aquaculture facilities, and breeders real-time insight into one of the most critical water quality parameters.

Dissolved oxygen plays a vital role in the health of fish, corals, and beneficial bacteria. Low oxygen levels can quickly lead to stress, poor coral health, and livestock loss. The Control X3 DO continuously monitors oxygen levels and can automatically activate equipment such as air pumps, skimmers, or circulation pumps whenever oxygen levels fall below your desired threshold.

Built on the trusted HYDROS platform, the X3 DO features industrial-grade reliability, cloud connectivity, local Wi-Fi control, and seamless expansion into the HYDROS Collective. With instant alerts and customizable automation, you'll always know your aquarium is protected.

Features

Dedicated Dissolved Oxygen (DO) Probe Port
Continuous real-time dissolved oxygen monitoring
Two HYDROS Sense Ports
Two Command Bus ports for HYDROS Collective expansion
Custom automation based on dissolved oxygen levels
Instant push notifications and alerts
Cloud access from anywhere
Local Wi-Fi operation even without internet
Dual-core 32-bit processor
IP65-rated splash-resistant enclosure
Aircraft-style waterproof connectors
Expandable with additional HYDROS controllers
Built on the HYDROS Safety Net architecture for maximum reliability

Monitor Your Aquarium

The HYDROS Control X3 DO can monitor and automate based on:

Dissolved Oxygen (DO)
Temperature
Water Level
Leak Detection
Flow Sensors
Magnetic Switches
Push Button Inputs
Additional HYDROS Sense Accessories

Create intelligent automation rules to increase aeration, activate backup equipment, or notify you immediately whenever dissolved oxygen levels move outside your desired range.

Perfect For

Reef Aquariums
Freshwater Aquariums
Fish Rooms
Coral Grow-Out Systems
Breeding Systems
Aquaculture Facilities
Quarantine Systems
High Bioload Aquariums

Specifications

Dual-Core 32-Bit Processor
Dedicated Dissolved Oxygen Probe Port
2 HYDROS Sense Ports
2 Command Bus Ports
IP65 Splash-Resistant Enclosure
Cloud & Local Wi-Fi Connectivity
HYDROS Collective Compatible
Compact Mounting Design

What's Included

HYDROS Control X3 DO Controller
Mounting Hardware
Quick Start Guide

Please Note: The dissolved oxygen probe and additional accessories may be sold separately depending on the package purchased. Please verify package contents before ordering.

Why Choose the HYDROS Control X3 DO?

Dissolved oxygen is often overlooked until it becomes a problem. Power outages, bacterial blooms, overcrowding, high temperatures, and equipment failures can all rapidly reduce oxygen levels.

The HYDROS Control X3 DO provides continuous monitoring and intelligent automation to help prevent these issues before they become emergencies. Whether you're protecting a prized reef aquarium or managing multiple systems, the X3 DO delivers peace of mind through reliable monitoring and control.

Shipping Information

FREE Standard Shipping

This item qualifies for FREE Standard Shipping within the contiguous United States.

FREE Standard Shipping
Processing Time: 1–3 Business Days
Estimated Delivery: 3–7 Business Days
Securely packaged for safe delivery
Tracking information will be emailed once your order ships

Why Shop with Infinity and Beyond Aquatics?

At Infinity and Beyond Aquatics, we know that dependable equipment is the foundation of a successful aquarium. That's why we offer trusted brands, competitive pricing, and knowledgeable support backed by real-world aquarium experience.

When you shop with us, you'll enjoy:

Authorized dealer for premium aquarium brands
Competitive pricing on trusted equipment
Fast, reliable order processing
Secure packaging to protect your investment
Friendly customer support from experienced hobbyists
A growing selection of freshwater, saltwater, and reef aquarium products

Whether you're monitoring a single display tank or building a fully automated aquarium system, Infinity and Beyond Aquatics is committed to helping you achieve long-term success.