Algaebase - a database
of information on algae that includes terrestrial, marine and
freshwater organisms. https://www.algaebase.org/
Seahorse.org -
Information on keeping seahorses as well as setting up macro algae
dominated aquaria. https://www.seahorse.org/
Wet Web Media - a
website offering expert advice on marine aquariums including some
information on algae species in the aquarium. http://www.wetwebmedia.com/