Mon-Thurs 7am-5pm PST
Fri 7am-4pm PST

Questions about products, orders, shipping?
Contact us by call or email


ReefBreeders Prism ATO Auto Top Off System


Item #: RT07717

Ships Free!

In Stock

ReefBreeders Prism ATO Auto Top Off

The Reef Breeders Prism-ATO is designed to work with aquariums of all sizes, from pico desktops and All-in-One aquariums with limited space, to large reef tanks with full sumps. The Prism ATO has 3 sensors and registers your water level in a fraction of a second. Its small platform allows it to be installed unobtrusively almost anywhere!

Feature Overview:

  • Ideal for all aquarium sizes over 2 gallons
  • Compact design allows for unobtrusive installation in AIO chambers, pico tanks, and sumps
  • Self-contained system -- no additional controllers required
  • 3 Water sensors for added safety
  • Includes 60" Tubing, Manual, Power Supply, Pump, & Tubing Holder
  • 12 Month USA warranty

Fully Self-Contained.

The Reef Breeders Prism-ATO is fully self-contained, meaning the controller and sensors are all contained in one small central unit. There is one plug for power in, and another plug for power out to the pump (included). That’s it. No more controllers to mount in your aquarium stand.

Three Water Level Sensors Onboard.

Every Prism ATO includes 3 sensors to determine your aquarium`s water level.
  • Low Level: If water drops below this point, the pump will be activated until water hits the next sensor.
  • Fill Level: 1" above the low level sensor, this sensor turns the fill pump off when it detects water.
  • High Level: 1" above the fill level, and 2" above the low level sensor, this sensor deactivates the pump when it senses water.

All Inclusive.

The Reef Breeders Prism-ATO includes everything you need to get started- Just add water! The Prism-ATO system includes the sensor and magnet mount, a small dc power supply, a pump, tubing, and a tubing holder that fits most aquarium rims. The magnet mount works with glass up to 1/2" thick, and does not require a clear pane of glass to function.

Every Reef Breeders Prism-ATO includes a full 12 month USA warranty.

Technical Specifications

Product Dimensions: 3" x 1" x 1.35" (In-tank Sensor) ; 1" Diameter x 1.25" (Outside Magnet)
Max. Glass Thickness: 1/2"
Ideal Tank Size / Type: AIO Chamber, In Sump, In Tank, Pico/Nano and All-in-One (AIO) Tanks over 2 gallons
Safety Features: 3 Sensors Total, High Water Level Sensor, IR Visual Level Sensor
Max. Head Height: 8 Feet
Included Accessories:60" Tubing, Manual, Power Supply, Pump, Tubing Holder

Manufacturer information

ReefBreeders LLC became one of the first retailers of black box LED fixtures in 2012. In the beginning of 2016, ReefBreeders introduced the Photon V2-- the second generation of their popular Photon LED series-- and broke away from the black box LED platform of the past, offering a truly exceptional product that not only has great light output, but actually looks good in a living room, and costs far less than brands like Aqua Illumination and Ecotech. ReefBreeders stands behind their USA warranty coverage and offers 2 years of full service on all their lights.

4 Stars


Reviewed on
March 30, 2021

No, I would not recommend this.

Not good for a nano

Pros: Easy installation

Cons: Not good on smaller nanos

I ordered this ato for my 15 gal mixed reef and it seems the application doesn’t work. I run my water level pretty high and this ato runs my water level pretty low before the ato pump kicks on and as a result throws off my salinity way off to stay consistent. I will probably look into another ato. This ato does work but just not on my small tank. Will work better on larger tanks.

Was this review helpful? 0 0


Reviewed on
March 10, 2021

Yes, I would recommend this.

Nice ATO

Pros: Small footprint

Cons: Tubing clip holder could look better

Easy to use, great little pump small footprint with some power is 👍. Would you Buy again, it’s replacing ato with dual float system. This is much nicer!

Was this review helpful? 1 0


Reviewed on
March 08, 2021

Yes, I would recommend this.

It works

It works will know in a month or two if it’s any good.

Was this review helpful? 1 0