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 wood effect skull is a strange but interesting aquarium ornament. This will provide your fish or other creatures with plenty of places to hide, explore and even breed. This somewhat scary looking piece of decor will look great in any aquarium, vivarium, or terrarium.. Approximate dimensions 12cm l x 9cm w x 14cm h .