Rock Grotto Aquarium Ornament. This realistic rock look is appealing to all aquarium creatures. They will vie for their favorite spot. Fish love the in and out action just like small ocean caves. Choose the large, medium or corner design for your style preference. Reptiles and small animals also love the hidden effect if you prefer a dry display. Made of resin and hand painted details give it a realistic look. Perfect for fish, reptiles, or small animals. Suitable for both aquariums and terrariums. Detailed finish looks like real rock.