Tank decor or ornaments can vary in size and shape, also color. Tank ornaments offer hiding places for your fish and can allow them to swim around them for fun. Tank ornaments can add dimension to your tank as well as character. You can get wooden decor, ceramic, plastic, or even live decor, like plants. Live decor is more like fish since you have to feed and care for them like any other live creature. Plastic decor is great and is easy to clean but can be hazardous is the decor can break easy which can be swallowed if it breaks into very small pieces. Wooden decor is great for marine or tropical life themed tanks. They give pizzaz to a tank and your fish. Ceramic decor is heavy and isn't easy for your fish to move which can be great if they like to swim rapidly and bump or move things. Ceramic decor is also easy to clean and lasts longer then most decorations these days. Be careful when choosing your tank decor because sometimes you can choose the wrong one and regret it later.