Betta ornaments are an exciting way to decorate your aquarium. With something for all tastes, they are an affordable way to enhance your display using fish-safe materials suitable for coldwater and tropical set ups.. Ta pineapple house is a bright and colourful cave ornament, great for any children's aquarium. Their fish will love to explore or hide here.. Approximate dimensions: 20.5Cm w x 13.5Cm d x 10.5Cm h .