Iron is a limiting factor in the growth of macro algae in marine aquariums. By promoting the growth of these types of algae, they will remove excess nutrients from the water and reduce growth of nuisance algae.
By increasing the iron levels of the aquarium water, red and green colours of macro algae will become more vibrant.
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Paul, my fish tank looks better than it has ever looked in its life, thanks to you! - Adam and Olga