5 Gallon ATO Containers


BUILT TO ORDER ITEM- Current lead time is 3 weeks (materials are “IN STOCK” for this build)
15″ x 6″ x  15″ ATO

5 Gallon ATO Containers

  • Exterior Wall Color*
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SKU: 5GallonATO Category:


The synergy Reef Series ATO Containers fit in line perfect with our 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 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


  • 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: $129.99 – $149.99


Additional information

Weight11 lbs
Dimensions11 × 21 × 20 in

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Exterior Wall Color


Customer Reviews

Based on 6 reviews
Denise Porter
Amazing ATO and customer service!

This is the second order I've placed from Synergy and they continue to be fantastic. I got almost instant help with my custom request which they accommodated at no additional charge. I had great communication with them and when they had a question, rather than just making a choice, they reached out for my feedback. When the container arrived, it looked even better than I imagined it would. Very professional and looks great with my system which is important because the ATO is visible by design. Looking forward to a bigger system and more products from Synergy!!! Best, D. Porter

Jolene Schaaf
Beautiful piece of equipment!

After receiving my ATO container I wanted more from Synergy Reef! The product is made very well and looks amazing! If it wasn’t such a pain to replumb my system, I’d get a matching sump!

Shawn Burkit
Great looking end product.

I am actually using this for a reservoir for a custom cooling/heating system on a CO2 laser. The product was had to find since I wasn't looking for equipment for this intention, but once I found this site, they were easy to work with and willing to fulfill all of my customization requests. I love the dimensions as well. It is difficult to find a good vertical 5 gallon container/ tank.

Lord Imson

Sure you can use a $5 HD bucket for your ATO container, but I will hands down always purchase this ATO for any build, especially when it perfectly matches the sump. ATO holes are in the perfect spot for tubes and cords, and the filler opening is just the right size for dumping water and sticking my arm in to work with the ATO pump. Lastly the capacity etching is beautiful! Very happy with this purchase!


Love my ATO. I’ve had it about a year now and it is one of my favorite items I’ve bought for my tank! It is super functional with the holes for the cord and tubes, and it looks amazing! This thing is flawless and a great addition to any tank! ????