The JIH Aquarium Fish Tank Plastic Plants and Cave Rock Decorations Decor Set 7 Pieces is a great way to add some style and realism to your aquarium. These plants are made of plastic, so they won’t hurt your fish, but they’ll still provide a comfortable and clean environment for them. The rock is made of resin, so it has a realistic texture and won’t smell. It’s also safe for both freshwater and saltwater environments.