5 Gallon ATO Containers


5 Gallon Synergy Reef Series ATO Containers – Auto Top Off in style! Current Lead Time is 1-2 weeks, 3 weeks on Grey color schemes.

BUILT TO ORDER ITEM- Current lead time is 1 weeks
15″ x 6″ x  15″ ATO

5 Gallon ATO Containers

    Reset options

    Storm Cloud comes with all white sides and back by default. Choose "All Clear" for storm Cloud. All other colors will have Clear Sides and back if "All Clear" is chosen. For solid colored sides and backs on these, please choose "Color to Match"

    *Color To Match

SKU: 5GallonATO Category:


The Synergy Reef Series ATO Containers fit in line perfect with our CL-26, TS-26, TS-34 and CL-34 series sumps. We have designed this model to be plug and play with these sumps. They can also be used with any existing reef tank setup. The Synergy Reef ATO is built of the highest quality domestic cast materials available. Our attention to detail is second to none. These are universal and will work with any ATO controller on the market.


When choosing your Exterior Color, there is an option for either All Clear or Color to Match sides and back. This is an example of the difference:

Clear Sides and Back

Color to Match Sides and Back


  • Standard – Clear Sides and Back ***** If you would like the sides and back the to be matching Color, please select “Color To Match” in the Exterior Wall Color Option above. For Storm Cloud choose “ALL CLEAR”.  Storm Cloud will have White sides/back with a Clear Smoke front. 
  • Dimensions: 15″ long x 6″ wide x 15″ high
  • Approx. 5 Gallon Storage Capacity
  • 1/4″ John Guest tubing holders for plug n play ATO connection.
  • 1.5″ Rear hole allows for power cord to be run outside the container if an internal pump is used.
  • Will work with all ATO control units
  • 4.5″ Fill hole for easy filling
  • Easy removable lid to prevent evaporation.
  • Laser Etched graduated Gallon or Liter markings on the front panel for easy measuring of water. Choose Option for Gallon or Liter.
  • Built in the USA!

MSRP: $164.99 – $174.99


Additional information

Weight11 lbs
Dimensions21 × 21 × 11 in

, , , , , , , , , , ,

Exterior Wall Color


Customer Reviews

Based on 18 reviews
Looks great and functions great

Not much to say! Great reservoir. I have 2 pumps feeding into two different tanks from this reservoir and it’s serving its purpose, probably the best looking reservoir in the market.

Greg Baugher
Beautifully built. Amazing quality.

It’s a beautiful piece of equipment. Definitely will buy from again.

Robert Peter
Great Ato

Great ato reservoir. I went with the black and green. Didn’t even hide it under the stand it looks so nice.

Don C

It was a hard time trying to decide on spending money on an ATO Res.. vs a standard bucket. My first thoughts were its to much money, shipping etc.. however i was pleasantly surprised on how beautiful the ATO is, how fast i received it, how i was notified of the status along the build. I am extremely happy with the build and would recommend Synergy to any and all. Good work team.. dam good work!

Quentin Smith
Perfect ATO

Perfectly matches my sump and Apex equipment.