Another simple thing to do is to get a solid piece of either 3/4" MDF or Plywood and paint it with a waterproof paint to use as a platform for the tank stand. It removes any single points of pressure, like a leg, and helps to distribute weight across a larger area. If you are really handy, you could put a 4 to 6 inch lip that could catch any minor spills and keep both the carpet and your future monster-in-law dry!