High simulation coral is used for landscaping in seawater tanks. The shape is realistic, the colors are bright and the dynamics is full; This can create an ideal underwater world for you Special ecological materials for aquariums, environmentally friendly for aquarium organisms provide a place to attach bacteria nitrifying Material: It is made of non-toxic silicone decorations and the plants at the bottom of the aquarium are resin. This looks real and natural. They can shine in the dark under ultraviolet light / blue light. Created a magnificent and mysterious underwater world. Note: These are not very large aquarium decorations Note: These are not very large aquarium decorations Note: You can accept the purchase after being optimistic about the size of the product