Amazon Frogbit and water spangles are easy to care for and fast growing. It is great cover for shrimp, Bettas and shy fish setups They can absorb the harmful nutrition thus controlling the algae and improving water quality Please refer to the images about the size of each plant Amazon Frogbit and water spangles are easy to care for and fast growing. It is great cover for shrimp, Betta’s and shy fish setups. They can absorb the harmful nutrition thus controlling the algae and improving water quality.