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 large castle is a colourful resin ornament which is great for children's aquariums. It is quite tall and has got lots of little holes for small fish to swim through and hide in. You could create a brilliant display when used with the betta medium castle ms222 and some cartoon character ornaments.. Approximate dimensions 16cm l x 15cm w x 29cm h .