Underwater Treasures Lava Cave is incredibly unique amongst aquarium decorations. The piece itself is an exceptionally natural looking volcanic feature, complete with sharp jagged rocks and brightly colored flowing lava. A large cavernous opening in the bottom allows fish and invertebrates to move freely underneath the volcano, while providing them with a quiet place to rest and relax. The piece is weighted so it will not float or be dislodged by a current or flow. These incredibly realistic decorations feature unique textures and are hand crafted and painted using only the highest quality materials. Underwater Treasures ornaments are all non-toxic, and safe for use in both freshwater and saltwater aquariums.