Not sure who you are responding to, but I'll take a swing at it.
I am more likely to die of a shark attack than bust a seam on a tank. Therefore, I don't feel the need to plan for such an unlikely event.
I do have a plan for an ATO that fails ON. Or a skimmer that goes nuts. Or a pinhole leak in a reactor hose. Or a thousand other stupid, unforced errors on my part. I have leak detectors hooked up to a controller. If water hits the floor, return pump shuts off, ATO solenoid shuts. Skimmer shuts. Manifold driven reactors shut. And my phone lights up like a Christmas tree.
Much cheaper than replacing livestock, floors, ceilings, etc.
Controller should always be on a separate circuit IMO. Or at least not on the same one that powers wet equipment.
Good luck out there. Stuff happens!