Black shrimp typically refers to two popular aquarium varieties: Black Neocaridina (Neocaridina davidi var. black) and Crystal Black Shrimp (Caridina cf. cantonensis). Black Neocaridina, also known as Black Rose Shrimp, are known for their deep, solid black color and hardiness, making them a good choice for beginners. Crystal Black Shrimp, on the other hand, have a striking black and white striped pattern and are more sensitive, requiring specific water parameters.