Animals without backbones or Invertebrates represent more than 95% of the known species on Earth. Marine invertebrates make up the most diverse, interesting, colorful and unusual species available within the marine aquarium hobby. They make great additions to most marine aquarium setups, as they can eat unwanted algae & excess foodstuffs; have diverse colorations and a large variety of shapes, which make any marine aquarium more interesting and visually appealing. In addition to providing clean up duties within the aquarium, marine invertebrates complement the fish and coral species with which they are kept.