ReefBreeders ATO

The ReefBreeders ATO is designed to be reliable, easy to set up, and clean looking in just about any reef system. It includes everything you need to start automatically maintaining your aquarium’s water level: a sensor, pump, 5 feet of black silicone tubing, a tubing mount, siphon break, and a waterproof magnetic mount.

For 2025, we’ve made several upgrades including a new, more robust power supply, a longer pump cable for easier placement, and a new pump with a slightly larger motor to further improve motor lifespan and reliability.

Key Features

All-in-one kit
Comes with pump, tubing, tubing holder, magnet-mounted sensor, power supply, and siphon break so you can get up and running quickly.

Compact IR sensor
The advanced infrared sensor is only 0.86" long, making it far less obtrusive in your tank and reducing the amount of water added during each top-off.

Clean, uniform look
All major components are finished in deep black to blend in with most sumps and displays.

Strong magnetic mount
Works on both glass and acrylic, and securely attaches to panels up to 5/8" thick.

Quiet, upgraded pump
Runs more quietly than our earlier Prism ATO pump, making for a less obtrusive experience.

Improved sealing
Refined seals on the sensor and magnet housing offer better protection and longer service life than the previous Prism ATO design.

Dry run protection
An integrated level sensor on the pump side detects when the reservoir is empty and automatically shuts the pump off to prevent damage.

Secure tubing holder
Designed to fit tank trims or euro braces up to 0.6" thick, keeping the outlet exactly where you want it.

Premium black tubing
Includes 6.5 feet of 1/4" ID black vinyl tubing for a neat, professional appearance.

Waterproof connections
IP65-rated plugs for both the power supply and pump add an extra layer of safety and durability.

Integrated siphon break
The included siphon break helps prevent unwanted siphoning by allowing air into the line when the pump is off. Because it can also allow a small amount of water to exit, it should always be positioned inside the rim of your aquarium, sump, or ATO reservoir.

Practical cord lengths
The pump and power supply each have 56" leads to the Y-cable, plus a 20" lead from the Y-cable to the ATO sensor, for a total reach of about 6.5 feet.

Backed by warranty
Comes with a 24‑month USA warranty, with optional 36- and 48‑month extended coverage available for added peace of mind.

Optional upgraded mounts
Enhanced magnetic mounts with integrated tubing holders are available separately if you want an even more streamlined installation.