Xp Aqua

Sumpless Auto Top Off System

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Discontinued by Bulk Reef Supply
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Xp Aqua's Sumpless ATO - Complete ATO & Surface Skimmer for Sumpless Aquariums 


Sumpless ATO is the first and only ATO designed specifically for aquariums without sumps. The combination of the sleek overflow box and the innovative dual-optical sensor ATO will help to keep your aquarium topped off and your water crystal clear. 


The overflow box easily mounts to any aquarium with its magnetic mount. It acts as a surface skimmer to rid your aquarium of undesirable oily surface skim and doubles as a media reactor for carbon, GFO or any media of your choice. 


XPAqua’s proprietary dual-optical sensor packs two precise level sensors in one incredibly small package. In addition to keeping your water level constant, the two sensors also work in concert with the intelligent QST programming to help prevent overfilling.  


With so many features never seen before in ATO’s, the XPAqua Sumpless ATO is the ultimate ATO solution for aquariums without sumps. 



Engineered specifically for aquariums without sumps

Dual-optical sensor for precise operation with secondary failsafe (QST Programming)

Doubles as an effective surface skimmer

Convenient media chamber for filtration media

Plug-and-play with all parts included

Works in complete darkness



Power Input: 120V AC, 60Hz

Return Pump Flow Rate: 74GPH

ATO DC Pump Max Head: 8.2 ft

ATO DC Pump Flow Rate: 74 gph

Controller Dimensions - 2.2" H x .88" W x 1.9" L

Sensor Cable Length - 10 feet

Pump Cable Length - 69 inches

Flexi Overflow Box: 3.94" x 2.17" x 6.30"

Max Tank Mounting Thickness: 1/2"

Max Volume of Media Chamber: 3.74" x 1.99" x 1.97"

1-der Stock Ultra Media: 3.54" x 1.5" x 1.89"

Power Supply Cable Length: 67 inches

Tubing Diameter: 9mm OD | 6.5mm ID


What's Included?

Sumpless ATO Controller Module+ Mounting Bracket w/dual-optical sensor

Flexi Overflow Box w/magnet mount

1x DC ATO Pump

1x DC Flexi Return Pump

1-der Stock Ultra Media Block

Tank mount tube bracket

6ft Water Tubing

Siphon Break

Power Supply

More Information
UPC 4714041211849
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Product Questions

Why does it beep every time it runs? I get it that it should beep and turn off if it goes over 30 seconds, but it never runs without beeping.
Question by: Michele on Jul 22, 2022, 3:35 PM
There are a couple reasons the unit would do an audible beep. At the bottom is the manual for the ATO unit as well.

Audible beep and blue and orange led flashing: QST Alarm. 1. Bubble interference or empty reservoir. Resolution: clean the sensor or move to an area away from the microbubbles/refill reservoir.

The other instance is when it first fills the aquarium after installation it will set a time. If the following refills are 6 times that of the initial refill then it will beep letting you know. you may need to recalibrate the initial fill time to stop the alarm.

Answer by: Rick Pucciarella (BRS Staff) on Jul 26, 2022, 12:11 PM
What is the o.d. & i.d. on the clear tubing ?
Question by: Chuck Lachney on Jan 16, 2022, 12:09 PM
The tubing size is inner 7mm / outer 9mm.
Answer by: Matt Lucero (BRS Staff) on Jan 17, 2022, 12:18 PM
Could this be used as an AIO filtration means for a quarantine tank? (roughly 20 gallons)
Question by: John Kaplan on May 6, 2019, 10:32 AM
Hey there,
Thanks for reaching out to us. We would recommend a HOB filter for filtration and you can use the Xp Aqua for your ATO in your QT. Happy Reefing!

Answer by: Mark Schlough on May 6, 2019, 4:37 PM
Will this work on a tank with a rim?
Question by: Jeremy Lake on May 2, 2019, 8:31 PM
Hi Jeremy, this Sumpless ATO will work on a tank with a rim.

Please let us know if you have any further questions.
Answer by: Matt on May 3, 2019, 9:10 AM