Black Knight Shrimp
Black knight shrimp, or black sakura shrimp, are solid black and contrast well against plants and light colored sand and gravel. Aquariumfishsale.com exotic shrimp are bred in Taiwan for color and aquarium stability. These shrimp are scavengers but will need some food, flake or sinking pellets.
Like clown fish and anemones, fancy shrimp love moss balls.