The good old marimo moss ball. One of the easiest in to grow in the hobby. Its almost impossible to kill. These plants are awesome for starting new tanks or to add surface area for shrimp and other animals to snack on the bits of food and biofilm that grow off of them. I personally own about 7 of them. The best part about them is they just have a knack for holding in lots of nutrients microfauna and bio film. What are your thoughts on the marimo moss ball