The Tfwadmx 4 PCS Decaying Trunk Aquarium Ornament Moss Resin Betta Fish Tank Decoration Artificial Freshwater & Saltwater Accessories for Fish Shrimp Aquatic Animals Goldfish Betta Fish Turtle is a great way to add some style and charm to your fish tank. These four pieces come in a set and are perfect for decorating and fishing. They’re made from safe resin that won’t change the quality of your water or cause harm to your fish.