​​Large Aquarium Tunnel & Cave, 3D Printed Rock Texture Fish Hideout with 2 Wide Top Entrances, Fish Tank Decor for Betta, Corydoras & Shrimp(Sand Yellow)

This upgraded large aquarium substrate viewer tunnel comes in 3 colors: gray, black and sand yellow. Designed to fit tank glass for ant-nest underwater viewing, it has a side cutaway flow channel to optimize water circulation and offer an extra entrance for shrimp and mini crabs. Featuring two wide top openings up to 2.7 in diameter, it offers a stress-free resting space for small fish, fry and shrimp. Made of aquarium-safe 3D printed plastic weighing 6.0 oz, it adopts realistic sedimentary rock texture for beneficial biofilm growth, with fully polished smooth edges to protect soft-skinned aquatic pets. This non-floating cave can be fixed firmly by tank substrate without suction cups, functioning as a swim-through tunnel and hiding shelter, perfect for freshwater tanks raising bettas, corys, axolotls and small crustaceans.Package Includes:1 x Small Fish Hideout, available in three colors (gray, black and sandy yellow)

• Large Substrate Viewer Tunnel with 3 Color Options (Gray, Black, Sand Yellow): This upgraded underground aquarium hideout fits against tank glass to form an ant-nest-style viewing structure for observing underwater substrate scenes. It features a side cutaway flow channel on the left pillar to help improve water circulation, reduce low-flow areas, and provide an extra side entrance for shrimp and mini crabs.
• Spacious Dual Top Entrances for Small Aquatic Pets: Equipped with two wide top openings up to 2.7 in in maximum diameter. Compared with narrow traditional caves, the larger entrances allow small fish, fry and shrimp to swim in and out more easily, providing a comfortable area for resting and exploring.
• Realistic Sedimentary Rock Texture & Material for Aquarium Use: Made of premium 3D printed plastic designed for aquarium use, total weight 6.0 oz (170 g). The stacked sedimentary stone texture in bone white creates a natural look and adds extra surface area for biofilm colonization. All edges are polished smooth to help reduce scratching for soft-skinned fish such as corydoras and axolotls.
• Stable Substrate-Buried Non-Floating Design: Lightweight at only 6 oz, and structurally designed to stay in place when covered by sand, gravel or clay pellets. Attach it to tank glass and cover the top with substrate while reserving the top vents—no additional suction cups required. Suitable for building hidden “basement” landscapes in freshwater tanks without taking up open swimming space.
• Multi-Functional Aquarium Decor & Shelter: Works as a swim-through tunnel, hiding cave and landscape ornament in one. Suitable for bettas, corys, shrimp, small fry and axolotls. Smooth rounded contours, connected flow passages and natural rock appearance blend into many freshwater tank layouts for extended use.​ ​