I know that splashing is the first thing you should fix to eliminate making a mess but for the sake of ideas, what are some of the things you can do to protect your wall? Wood veneer the back of the stand and cut holes for pvc is an idea but the wood may be a problem, I think, over time. I also wondered if maybe acrylic or glass could be cut the same size as the tank/stand and put on the wall somehow. Not sure what that would look like but it would wipe off easy.

