floor protection

Does anyone have any suggestions or experience in placing "something" under
a tank stand to help protect hard wood floors? I have a 75 gallon with the
standard wood stand with cabinets. I am thinking of putting something, but I
don't know what yet, between the stand and the floor, just to help protect
the wood finish. I know it's virtually impossible not to have occasional
water spills when doing maintenance, etc., which is why I'm thinking about
putting something down first. But I'm not sure it's a good idea though
(stand integrity?). Any thoughts?

Thanks, Patrick