Safety Material: Aquarium resin tree root is made of environment-friendly resin material. This environment-friendly resin material is non-toxic and will not cause harm to your aquatic animals. It is durable and will not fade after a long time. Exterior:Aquarium resin tree house decoration with a pile of stones around the roots and two small wooden doors above the roots, which make the aquarium more cute and delicate. Stable and Not Easy to Fall: The base of aquarium hollow root decoration is flat, can be stably placed in the bottom of the aquarium, not floating, rather than floating in the top. Decorative air pump: Since the decorative center of the aquarium is empty, the oxygen pump can be placed in the center of the tree house to hide the air pump, which will make the aquarium more beautiful (without the air pump). Application: This tree house aquarium ornament can be placed in all terrariums, aquariums, fresh water and seawater. Can decorate fish tank, home furnishings, office desk furnishings. Suitable for a variety of small animals such as fry, guppies, shrimp and cichlids.