Tile, unlike wood, will not flex. It will break. So it will greatly depend on the stability of your underlying subfloor and joists, unless of course you are on a concrete slab. The larger the tile, the smaller amount of floor deflection that it can tolerate before breaking.
So I would not be as concerned about the actual load bearing capacity of the individual tile that the feet of the stand are on (although that may come into play) but on the deflection of the floor under the load of the tank.
Of course, the individual tiles will also crack if they are not installed properly. Air gaps underneath the tile will put all of the load on the tile, instead of transfering it to the floor.
I don't think that I would recommend a tile floor unless you were on a slab. But I am not a tile professional, so take that as just my opinion.