Plastic Bottle Aquarium Tunnel

Turn a plastic bottle into a decorative aquarium tunnel! Cut off the neck and bottom of a plastic bottle and cut a long oval hole out of the side of the bottle. Find decorative stone or plastic bead necklaces and glue the necklaces around the tunnel with aquarium silicone or glue individual rocks and beads onto the tunnel. Drape a necklace across the bottom of the bottle for additional weight and decoration.