Aquarium Ornament Rockery Fish Tank Underwater Landscape Hiding Cave Decoration This rockery is made from polyresin and makes an exciting ornament in any aquarium. Offers the natural environment feeling. Change your aquarium into a beautiful scenery . Make your aquarium vividly ,add to natural color. Use the simple method decorate and maintenance your aquarium. Fish can hide and Pass through the hole and crannies within ,and they won't die. No rot or any algae problems Rockeries fish tank ornament . Material: Polyresin.