I'd imagine it would take a really big and solid person to bump and move a tank set up in such a manner.Even 3 high, that looks like someone could bump them or a small quake and they're going to pancake.
J jaws7777 this setup your running for a long time? That size tank either cinder or milk crate will work. I had my pup setup for at less a year before I broke it down. Cinders are heavy to move but not milk crates. If floor isn’t leveled a lot I lifted it alone. If more than 1/4” than shim it with composite shims. Enjoy and good luck.
Or one really hyperactive kid.I'd imagine it would take a really big and solid person to bump and move a tank set up in such a manner.
That's a lot of weight between the bricks and the tank but I guess the right sized kid could topple it.Or one really hyperactive kid.
All 4 sides of the cinder gets shimmed right