I called many insurance companies last year, they don't cover livestock, and they are tricky about what they actually cover.
1. Most companies will not cover water damage
2. Any company that covers water damage, will only count personal negligence
3. The water from your tank is not considered "water damage" it's considered "sewage" so not covered under water damage
The only way you can get things covered, is no matter what happens you would have to say something along the lines of "I was an idiot and left the hose running". Because they are covering you, not "manufacturer negligence" in a tank failure or equipment failure.
I spent hours on the phone with different agents, they are sneaky in the way they break things down and the wording.