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Green hair algae. Green Hair Algae. Is probably the most common of all algae you will come across in your aquarium and can take on many forms, from spots, hair, or bushy appearance. Light green in colour and can reach lengths of over 1 inch and if left on its own, it will cause problems.
Red Algae. Red algae are almost exclusively marine and include many edible and economically important species, including nori and laver. Red algae are also the source of carageenan and agar, which are used as food thickeners and stabilizers.Red algae are mostly large, complex seaweeds. There are four thousand to six thousand species.lgae may be unicellular, colonial, or multicellular. Some algae, like the diatoms, are microscopically small. Other algae, like kelp, are as big as trees. Some algae, the phytoplankton, drift in the water. Other algae, the epiphitic or benthic algae, grow attached to rocks, docks, plants, and other solid objects.