Heavy tanks on tile

[Jeff]

Anyone had any issues or concerns with medium size tanks (120-180gal) sitting on tile floors? I'm going to be tiling a floor where I want to put a tank. Getting things very very level in terms of the tile is obviously crucial...any other advice that anyone can offer for things to watch for? I'll probably be going with some sort of stone tile rather than ceramic...more for the strength than anything but I also prefer the look.

Thanks