I know there has to be a system that does this. I used to work for an aquarium company and there are systems that hook up to your aquarium and can control all the water parameters and will automatically dose, feed etc. It also has alarm functions that will send you an email, sms or what not if the temperature or other parameters get out of range.
Edit: Just found this, I am sure you could adapt it to function, I bet there is something better, but a quick google search came up with it. http://www.qasupplies.com/voicdial51...l#.UuPhiGQ1gy4