Shrimp are very popular due to their often vivid colors and sometimes interactive disposition.  They come in all shapes and sizes, and have great value in their environments as they scavenge left over foods and debris essentially cleaning up as they move along.  Some Shrimp have a symbiotic relationship with anemones.  Some Shrimp will devour nuisance anemones.  They are one of the most essential crustaceans and will thrive in most environments.