IceCap ATO



in stock

Replenish Evaporated Water... with Confidence!

The IceCap ATO is a reliable dual optical sensor Auto Top Off management system that monitors and automates refilling evaporated water. Includes everything needed to install and operate.    
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Refill the water that has evaporated... With Belief!

IceCap ATO monitors and replenishes the IceCap ATO monitors and replenishes evaporated water and eliminates the chore of manually adding water. An Auto Top Off (ATO) system is one of the most crucial components of an aquarium with saltwater and is an absolute must-have for any reefkeeper.  in order to keep your aquarium's water in a stable state.


IceCap ATO IceCap ATO is well-thought out and automated system that is system that is fail-safe and uses two (2) optical sensors to check the level of the water in the sump or aquarium. The second sensor is a secondary optical sensor that provides immediate protection against the malfunction of the first sensor. It is the best part, it's easy to set up and has no moving parts that could fail.


It also alerts you when the IceCap ATO also alerts you when the top of your reservoir becomes dangerously low, to stop the water pump from going dry. An LED indicator with a bright light allows you to visually check the condition that is your IceCap ATO, as well as any issues that could arise.

Plug and Play

Simply move the base of your magnet optical sensor to the desired level of water in your sump aquarium.A ItaEUR(tm)s easy!

Mounts to most clear painted, tinted or painted surfaces. Wall thickness maximum 1 inch (12.7mm)

All Included!

Everything needed to install and operate. Includes:
  • controller,
  • 2x optical sensors
  • Power adapter,
  • DC brushless pump that is capable of pumping at 6 feet in height with a flow of 74 gph.
  • 6.5 feet of tubing that is water-based with a tubing holder.
Work in total darkness! "    
1.45 lbs
10.5 × 6.5 × 2.75 in


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Helpful Questions From Clients
Frequently Asked Questions
Is hiring a professional necessary to set up a saltwater aquarium?

As a general rule, a larger custom aquarium might require installation by a professional. However, a kit from our online fish store is relatively affordable and beginner friendly. That means you should have no problem setting it up yourself.

Which saltwater aquarium fish should you choose when starting out?

Consider a yellow tang fish. This popular saltwater aquarium fish does a great job of coexisting with other types of fish you’ll find in our online fish store.

How does a saltwater aquarium differ from a freshwater one?

Saltwater aquariums require a bit more maintenance and monitoring than freshwater tanks. Different fish require different levels of salinity, pH tolerances, and temperature requirements. They also require specialized pumps, filters, and other equipment that can handle salt. We can guide you through everything you need to know to set up a healthy, thriving reef tank.

Do fish in a saltwater aquarium swim in a school?

That depends on the species. However, if it’s a fish that swims in a school in the wild, they’ll do the same in an aquarium. Some fish that swim in schools include the green and blue chromis, cardinalfish, and dartfish, for example. When ordering from an online fish store, make sure you do your research on how specific fish species behave to ensure they’ll school (or at least coexist) with your current fish.

Is the effort required to maintain a saltwater aquarium worth it?

Yes! Many aquarists dream of owning thriving saltwater aquariums. You have a tiny piece of the ocean in your home, featuring magical and exotic fish that can only survive in saltwater.