Penn Plax Stone Replica Aquarium Decoration Realistic Granite Look with Fish Hideaway Stackable Large granite rock replica has a natural round shape in black, white, and grey. Three large holes allow fish to pass through to reduce boredom and promotes breeding. This aquarium decoration provides visual interest for you and your fish. Holes provide a hideaway 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. Display this aquarium ornament alone or use as a base to stack additional stones for a custom environment (sold separately). The flat top provides a sturdy base for smaller stones to sit. Made of safe durable resin, this aquarium decoration is safe for use in both freshwater and saltwater aquariums. Stone measures 6 inches long by 5.5 inches wide and 3.5 inches high.