The Uniclife Aquarium Decorations Resin Coral Rock Mountain Cave Fish Tank Decor Ornaments Fish House for Betta Rest Hide Play Breed is a great way to add some style and color to your fish tank. Made of high-quality resin, this ornament is perfect for any fish lover. The flat bottom makes it stand steadily in your aquarium, and the four cave entry/exit holes provide plenty of room for your fish to swim around.