Yes, it reduces the life of the tank by 10-15%. It should never be used on an old or poorly made tank. Within reason, if you bought a new name brand aquarium it should last longer than you will likely keep it even with the wavebox. The danger is in buying a homemade tank from a garage sale or a tank that is old and has been drained and filled and moved a few times, that stresses the seams a lot and it doesn't take much more to breach them.