Ha ha! In all seriousness, everyone should give some thought to catastrophic events and the minimum planning and action needed to survive. Say, you are at work, and your house burns down. Do you have copies of important documents, know your insurance policy numbers, have their phone numbers so you can call them? Besides losing my house, I would lose my boat, truck, piano and harp in the fire. i can see the insurance companies being less than helpful if I don't have a policy number for them. I have copies of all that stuff, including titles to everything, on a flash drive, in Google photo albums, on a cheat sheet in my wallet and copies in my survivor back pack.
Do you know what to do to protect yourself during an earthquake? They recommend keeping heavy shoes, gloves, helmet under the bed so you can protect yourself from the ruble after the earthquake. They also recommend having a 72 hour supply of food and water.
What about a nuclear disaster? I don't think there would ever be a direct hit where I live, but if something happened in San Francisco or Portland, if the power grid was hit, we would have no food or supplies coming into our area, and no power for months. My fish would do fine if my generator works. They recommend having plastic sheeting and duct tape to seal off a room until the all clear is given.
Every one should have a disaster plan--how and where to meet up if the family is separated--that kind of stuff. How much warning did the people who lived below the Oroville Dam have when they were evacuated? How much warning did the people in the Napa fires have? Obviously not enough, as many people died.
Coming back to your original question, things that can be secured, bolted to the wall should be. So if you can secure your tank and stand, you are ahead of the game.