Penn Plax Stone Replica Aquarium Decoration Realistic Granite Look with Fish Hideaway 8 Piece Set This 8 piece set of granite stone replicas has a realistic shape in shades of grey and black. Set includes 3 small stones, 3 medium stones, and 2 large stones. This aquarium decoration provides visual interest for you and your fish. Holes provide a hideaway for your fish to rest or hide reducing stress and aggression. These granite stone replicas are perfect for cichlid tanks since this fish is territorial and must create their own space. These aquarium ornaments mimic what is found in an oceanic environment. Since each rock is separate from the other, you can arrange the stones according to your fish tank size and needs. The larger stones have a flat top for stacking and stability. Made of safe durable resin, this aquarium decoration is safe for use in both freshwater and saltwater aquariums. Additional stones can be purchased separately to create even larger displays.