A vivarium wall device system comprising: a piece of coral or a piece of wood, the piece having a glass-side surface, upper surface, lower surface, and three side surfaces, and where the glass-side surface is generally flat and regular a vivarium wall attachment means comprising: a first inside magnet, generally permanently attached to the glass-side surface a first outside magnet, configured to be removeably and magnetically attachable to the first inside magnet where when the first inside magnet is configured to be located inside the vivarium and magnetically attach to a first outside magnet located outside of the vivarium, and where the magnetic attraction occurs across a vivarium wall, and the coefficient of friction of the vivarium wall and the magnetic force tend to hold the piece of coral in place on the vivarium wall.
