Ah, pre-disastered. That's good.
That was just a scary sight. I know some people that have really screwed up their wood floors with aquariums.
You putting a dolly under the 55 gallon salt water drum? Figured you would likely build something. I am too lazy, I ordered two heavy duty dollys for my two drums after I had to drain them into other containers just to move them yesterday. Tile is going down in my "fish room" as well as half of my house this week. Wish I had the setup that you are working on.