I have an ATO that I like. It is the:
http://www.bulkreefsupply.com/auqa-gadget-hydrofill-ato-controller-system-innovative-marine.html?gclid=CM6f3vHeyr0CFS9p7AodiRYA0w
The problem is that it fails right before I travel. Thanksgiving it failed and would not turn on the pump at the low level...