This aquarium moss ledge makes a great addition to any fish tank. Shrimp love to graze and hang out in the moss. Bettas like resting and laying on it like a bed or a hammock. Use java moss or any other type of aquatic moss. Use some fishing line to tie on a portion of moss, then place the moss ledge anywhere in your aquarium and watch it grow. The moss will absorb harmful nitrates from the water making it cleaner for your inhabitants. Moss not included.