HYDROS Control X3-DO, Dissolved Oxygen Monitor
SKU: HDRS-CX3-DO
MSRP: $ 399.99
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Available Through Authorized Retailer
- The HYDROS X3-DO controller tracks dissolved oxygen levels in your reef tank through the HYDROS app.
- Real-time DO readings trigger instant alerts before oxygen drops harm to livestock.
- Designed for advanced hobbyists or commercial aquariums managing high-bioload systems where oxygen depletion is a real risk.
HYDROS
USA-built aquarium automation system that monitors & controls equipment from an intuitive app.
HYDROS Control X3-DO Dissolved Oxygen Controller
Oxygen is one of the most critical parameters in a marine aquarium, and one of the most commonly skipped. The HYDROS Control X3-DO changes that. It is a dedicated aquarium controller built around a specialized Dissolved Oxygen (DO) probe port, giving reef keepers a direct, real-time view of oxygen saturation in their system. Paired with the HYDROS app, it sends instant alerts the moment DO levels begin to fall, so you can act before livestock are at risk.
The X3-DO also includes two Sense ports for connecting temperature sensors, leak detectors, and other compatible accessories. It connects over 2.4GHz WiFi, requires no coding to set up, and is engineered, assembled, and supported at CoralVue's headquarters in Slidell, Louisiana.
Key Features:
- Dedicated Dissolved Oxygen probe port for real-time oxygen saturation monitoring
- Instant app-based alerts when DO levels drop below set thresholds
- 2 Sense ports compatible with temperature sensors, leak detectors, and more
- WiFi connectivity over 2.4GHz for remote monitoring and control
- App-based setup and operation, no coding required
- Made in the USA at CoralVue's Slidell, Louisiana facility
- Compatible with the broader HYDROS ecosystem of controllers and accessories
Ideal For:
- Reef aquarium keepers who want to monitor dissolved oxygen as a regularly tracked parameter
- Advanced hobbyists managing high-bioload systems where oxygen depletion is a real risk
- Aquarists who have experienced unexplained overnight livestock losses and want earlier warning systems
- Professionals or serious hobbyists who track multiple water parameters through a single app-based platform
- Anyone running heavily stocked tanks, coral propagation systems, or fish-only displays where gas exchange is critical
Pro Tips:
- Baseline your DO readings before relying on alerts. Dissolved oxygen levels fluctuate daily, peaking in the afternoon and dropping overnight. Run the probe for several days to set alert thresholds that reflect your tank's normal range, not a default.
- Pair the X3-DO with a quality skimmer or surface agitator. The controller signals when DO is low. Skimmers and agitators maintain levels. Monitoring is most useful with equipment to respond swiftly.
- Check probe placement. Dissolved oxygen readings vary depending on where the probe sits in the water column. Place it in an area with consistent flow, away from direct return pump output, to get the most representative reading of your system.
What's Included:
- HYDROS Control X3-DO controller
- Note: Dissolved Oxygen probe sold separately. Mobile device and power supply required but not included.
Specifications:
- Dissolved Oxygen Probe Ports: 1
- Sense Ports: 2 (compatible with temperature sensors, leak detectors, and more)
- Wireless Connectivity: WiFi 2.4GHz
- App Control: Yes, iOS and Android
- Coding Required: No
- Dimensions: 5in x 2.7in x 2.3in
- Country of Origin: Made in USA (Slidell, Louisiana)
- Power Supply: Required, not included
WARRANTY
CoralVue, Inc. hereby guarantees this product to be free from defects in material and workmanship for a period of:
- One (1) year warranty on the device body/housing
- One (1) year warranty on dosing pump motor (not dosing head(s))
- Tubing, head rollers, and head bushings are considered wearable parts because they experience regular friction, pressure, and use over time, leading to natural degradation. Since these components are expected to wear out during normal operation, they are not covered under the limited warranty.
Warranty is activated on the date of purchase.
This Standard Limited Warranty applies and is limited as follows:
- To the product only as long as it remains in the possession of the original purchaser.
- To the product that has not been subject to accident, misuse, or abuse.
- To the product that has not been modified, altered, defaced, or had repairs made or attempted by other than CoralVue, Inc.
- That CoralVue be immediately notified in writing within ten (10) days of the owner's or his agent's first knowledge of the defect.
- That CoralVue, Inc. shall be given the first opportunity to make any repairs, replacements, or corrections to the defective construction within a reasonable period of time.
- Under no circumstances shall CoralVue and/or the Manufacturer be liable by virtue of this warranty or otherwise for damage to any person or property whatsoever for any special, indirect, secondary, or consequential damages of any nature, however arising out of the use or inability to use because of the product defect.
Set Up Instructions:
- Download the HYDROS app on your iOS or Android device.
- Power the X3-DO using a compatible power supply (not included).
- Follow the in-app setup to connect the controller to your 2.4GHz WiFi network.
- Connect your Dissolved Oxygen probe (sold separately) to the dedicated DO probe port.
- Connect any optional sense accessories (temperature sensors, leak detectors) to the two Sense ports.
- Set your dissolved oxygen alert thresholds in the app based on your system's baseline readings.
- Monitor readings and alerts through the HYDROS app on your mobile device.
Note: Refer to your Dissolved Oxygen probe's documentation for calibration instructions before first use.