Macro Algae such as Chaetomorpha or usually known as just Chaeto is a great filtration algae to consume nitrates and phosphate in your saltwater aquarium.  Macro algae is a great natural way to have filtration in your aquarium and a great spot for pods and life to breed and multiply.  

There are many different types of Macro Algae that can be used in a saltwater aquarium.  It is usually best to use them in a sump system with a light running 24/7 for continued growth.