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  • Just a quick note to thank you again and express my appreciation for all your help on this purchase. Your guys are great!
    - Rich
  • Thank you for the excellent service. Very impressed with service from you folks.
    - Tim
  • I was kind of leery about shelling out that kind of money without knowing what kind customer service I would get. Not anymore! I now feel like I made a wise choice.
    - Nicole
  • John was excellent in answering all my questions and even talked at length about new products and fish related stuff. I really enjoyed doing business with this company!
    - Travis
  • I just want to say thank you greatly for all of your assistance! I am highly impressed by your customer service focus.
    - Nicole
  • The item that I purchased was delivered a lot faster than expected, not to mention a professional job packing the light.
    - Michael
  • Thank you, John, for your prompt attention... I will definitely order from you guys again!
    - Jack
  • Tank is gorgeous. Whole family is loving it. Now we're spending our evenings watching it instead of TV!
    - Joan
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    - Lenny
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  • We can't thank you enough! The chiller just arrived as you promised and we are back in business! You are a miracle-worker!
    - Dr. Delbridge, PMP
  • I've been in the hobby for almost 5 years now and have dealt with a lot of vendors. I am very impressed with the packaging and fast shipment!
    - Thai
  • When it comes time to buy a new tank. Fish Tanks Direct will be the first place I go...
    - Marc
  • Customer satisfaction is certainly a top priority for you, and we would definitely want to do business with you again.
    - Janet
  • I am writing this e-mail to say thank you for your great customer service.
    - Jimmy
  • The tank was delivered safe and sound. More over... the way it was packaged up for shipment was Excellent!
    - Darren
  • I couldn't find a better price on the item I wanted! The best price and the best service? You guys are great.
    - Dave
  • Fish Tanks Direct is PHENOMENAL! Their customer service is hands down the best I’ve come across in 10 years of reef keeping.
    - Wesley
  • I must say as being a business owner, I commend your company on the customer service and speed of your deliveries.
    - Rob
  • Thank you very much for your fast and efficient service... awesome!
    - Marlene
  • Just wanted to say thanks again for all you and your team did in assisting me with the fish tank. It looks great and I'm a very satisfied customer.
    - Scott
  • Thank you, John!!! Great customer service... give yourself a pat on the back!
    - Dary
  • Thank you sooo much for all your help. We love our new acrylic tank and setup. Everything is so much clearer and the color of the fish is much truer.
    - Jone H

Icecap Dual Optical Auto Top Off Controller

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Product Description

Product Description

An Auto Top Off (ATO) system is notably one of the most important pieces of equipment for a saltwater aquarium and simply a must have for any reef keeper. The IceCap ATO monitors and replenishes evaporated water eliminating the daily task of adding water manually just to keep your aquariums water stable.


The IceCap ATO is a well thought out automated system with a fail-safe design that uses two (2) optical sensors to monitor the fluid level of your aquarium or sump. The second optical sensor provides real-time protection against failure of the first sensor. Best of all, it is very easy to install and contains no moving parts that can fail.


The IceCap ATO also alerts you when your top off reservoir gets dangerously low to prevent the water pump from running dry. A bright LED indicator will allow you to visually see the status of your IceCap ATO as well as any possible issues.

Plug and Play

You simply move the magnet optical sensor base to the desired water level within your sump or aquarium. It’s that easy!

Mounts to Most Clear, Tinted or Painted Surfaces
Max wall thickness: 1/2 inch (12.7mm)

Everything Included!

Everything provided for installation and operation.


  • controller,
  • 2x optical sensors,
  • power adapter,
  • DC brushless pump capable of pumping to a height of ~6 feet and a maximum flow rate of ~74 gph and
  • 6.5' of water tubing with tubing holder.

Will work in complete darkness!

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