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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.
If an excess of any are available, algae will grow like wildfire, just like weeds growing in a garden. Obviously you can't do without water in your aquarium, but you can control the amount of light and nutrients are in the water.Here are the common reasons for algae overgrowth. 1  Lights left on too long. 2  Aquarium in a location with direct sunlight. Clean It Up-If you see algae beginning to grow on the glass, rocks, or other hard surfaces of the tank, remove it. 2  Scrape the glass, remove rocks and scrub them, and vacuum the gravel when you perform water changes. 3  Keep Live Plants â Live plants will use many of the nutrients that algae thrive upon.