SpringSmart Aquarium Hideaway Rocks for Aquatic Pets to Breed, Play and Rest, Safe Non Toxic Ceramic Fish Tank Ornaments, Small Decor Betta (3.7"x2.7"x2"(1 pc))

1. A COSY HIDEOUT FOR SMALL FISH - Betta, shrimp, guppies and fry can hide, rest and breed in this ceramic cave ornament, easing stress in community tanks; axolotls, cory catfish and mystery snails love it too. 2. SMOOTH INSIDE, GENTLE ON FINS - Made of ceramic fired at high temperature, with a smooth interior that will not scrape delicate fins and a frosted granite-effect exterior that looks like a real rock in any aquascape. It is heavy so it can stay in place when in fish tank. 3. SUPPORTS HEALTHY WATER - The porous ceramic surface gives beneficial nitrifying bacteria a home, helping keep water stable in tropical, freshwater and saltwater tanks. 4. SIZED FOR NANO TANKS - Each cave measures 9.4 x 5.1 x 6.9 cm with dual 3cm openings, and suits 1-40 litre tanks; made for bettas and other small fish, not for large goldfish or large cichlids; place it 2-3 cm from the tank wall so fish never get wedged. 5. EASY TO AQUASCAPE - 1 piece per pack, combine with gravel, wood and plants to build your own aquascape feature; Stack more cave to build a multi-level hotel for large tank; rinse and soak for 24 hours before first use.