The biOrb Flower Balls are inspired by plants from around the world. The biOrb Flower Ball with Daisies is inspired by the British Starwort, a native aquatic plant with tiny white flowers, the biOrb Green Flower Ball is inspired by Japanese slow-growing moss species of Zen gardens, and the biOrb Purple and Pink Flower Balls are inspired by the decorative moss phlox of Shibazakura. Internally weighted so it stays in place easily. Suitable for all biOrb aquariums. Compatible with freshwater, saltwater, and tropical aquarium setups.