Provide Concealment and Safety: This aquarium cave not only provides a safe shelter for timid fish, shrimps, and newly added fish, allowing them to avoid strong light, strong water currents, or attacks from other mates, but also protects them from potential assaults.Open Design: It can help you to observe their movements more easily, making it very suitable for fish, shrimp, snails, and other small reptiles. You can place it easily by just removing the base, leaning it against the glass, and then put it back around the cave. Appearance, Size and Opening Dimensions: This hidden cave is available in a variety of colors to match characteristics of your fish and shrimps as well as the aesthetics of your aquarium. Please note: The product is about 22 cm (length) x 13.5 cm (width) x 7.5 cm (height) and the opening size is about 5.5 cm in length x 4.5 cm in width. Please refer to the product size and opening size before purchasing to ensure that your fish are smaller than the opening size.Safe Material: Our hidden cave tunnel is made of PLA material through 3D printing to ensure that it can withstand harsh conditions of aquatic organisms, can be safe and durable, and not affect water quality. It is suitable for fish and shrimps of all ages and can ensure that your fish and shrimp enjoy a safe and long-lasting natural shelter.Enhance Overall Aesthetics: It adds depth and authenticity to your aquarium landscape or glass container and can help you to make the most of the available space while fully integrating with the natural environment to create a vibrant atmosphere.