You could put a float switch in to control the power to the PH
but again, this is making it harder than it should be
You could also put a battery back up or some kind of power supply to keep the power to the tank running even when the power is out in the house. Then rig up a pager system to page you when the power goes out if you are away. Then you know you would have x amount of time to get home if the power supply was limited. 8)
Would be cool actually.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,