Every time I see a suggestion to place a piece of foam, plastic, neoprene, or (shudder) a carpet sample underneath an aquarium or aquarium stand I cringe a little bit.  Okay, so they are great at smoothing out any small gaps or imperfections to lessen stress on your tank.  The problem with these materials is that they create a very thin gap on top of your stand or flooring where saltwater can puddle up and never return.  While minor spills here and there don’t cause too many problems, one major spill of saltwater and a few months time is all it takes to permanently ruin the flooring underneath your stand.  There’s a better way–Dri-Dek is a self draining interlocking tiles that don’t seem to be used very often in the aquarium hobby for this purpose, yet they are nearly perfect for the application.  The rubber tiles create a large air gap to allow saltwater spills to dry on their own, or with a little help from a fan.  Cut the tiles with a pair of scissors and lay your aquarium or stand right on top of it. Dri-Dek tiles come in a range of colors, they start at $4.35 per square foot and for more information, visit the Dri-Dek website.