[TheReefGeek]

And in terms of "over-engineering" I think that a sprinkler solenoid and timer is just as easy to install than a float valve, if not easier because you dont have to drill anything.

Sorry this sounded so harsh, but when it comes to auto-top off and the potential for flooding, I take giving accurate information very seriously because it is the kind of thing that gets people out of the hobby after a flood that kills off your tank.