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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.
Plant-Like Protists (Red, Brown, and Green Algae) 1) Red Algae: live deep in the water, can harvest light energy very well, contains chlorophyll A and phycobilins; commonly referred to as seaweeds. 2) Brown Algae: contain chlorophyll a and c and a brown pigment called fucoxanthin, largest and most complex algae, found in shallow, cool, costal water.