I think the temperature stuff would be no problem - electronic controls
are already available specifically for fish tanks and I would think one
of them will plug into your computer for the text messaging part of
things. I'm sure there's also non-fish-specific equipment that will do
this.

I've seen electronic pH meters as well.

For lighting, I'd bet there's something, but the easiest would be to
have something which senses a loss of power.... But then, how's it
gonna send you a message with no power? Perhaps program the UPS
software on your computer to send the text message when the UPS kicks
in (and again when it starts up again) - then you'd know your house
lost power. (This would require an "always on" internet connection -
make sure you've got good firewalls and anti-virus software in place.)

Don't look for stuff made for aquariums - it's not all gonna exist -
it's too expensive - look for stuff made for labs, plants and similar
industrial application - then pretty much everything will exist (for a
price). If you have specific questions, I'd be willing to run a few
past our metrology department (I work in a non-clinical testing lab -
in IT).

IMO, knowing if the power goes out, having redundant filters and
redundant heating would take care of the biggest concerns.

Liz

PS: Will post a separate reply to NetMax's idea later...