SPORN Aquarium Decoration, Rock Tumbles SAFE: Made of 100% safe resin material with hand painted colors that will not harm your fish. Crafted from premium quality material it won't fade, decay or discolors in water. Compatible with both saltwater and freshwater. AQUASCAPE YOUR FISH TANK: Rocks are the most raw form of decoration that enables an authentic look and offers fishes a habitat similar to their native one. For the fish tank owners who prefer to give a natural look, this stunning rock structure are a must have - just purely asthetic. ITS ROCKING: The incredible detailing and the beautiful vibrant color combine to give it an authentic, realistic look that stands out. They are versatile enough to complement any themed fish tank decor. Rough and uneven surface allows space for essential bacteria to grow. FISH HIDEAWAY: Aquarium decoration is not merely a piece of decor, but they serve an important purpose too! They prove to be a great hideaway for your smaller fish where they can explore, play, hide or lay their eggs. They do work as a great territorial marker, reduces aggression and fish stress by providing shelter. MINIMUM MAINTENANCE: It's realistic, its visually pleasing and whats more? You won't have a hard time maintaining it. Just remove it from the package, rinse well under hot water and place it in the aquarium. Easy to clean it with hot water and fish tank dedicated plastic bristle brush.