I have a portable electric fence camping which protects against bears. It's portable and sets up in 5 minutes. I can loan it to you. No tank modifications required just fence it off. Would surely stop the kids from going behind the tank. At least once. It also serves as a great babysitter child compound.
Good super early morning,
lol omg that’s funny, except I see the children being smart enough to know it’s electified. However, my older brother, I’m starting to really really wonder if he would just go hmmm “I wonder what will happen if I......... zzzzzzzap! Then as has bad as it was having him live with me and torment me, I would have to give him cpr. I really hope I have my personal mouth guard on hand.