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.. Betta medium castle is a colourful resin ornament which is great for children's aquariums. You could create a great display when used with the betta large castle ms223 and some cartoon character ornaments.. Approximate dimensions 17cm l x 11cm w x 14cm h .