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Step 1
Consider whether the algae is serious enough of a problem to clean. Algae is not necessarily a bad thing, but rather a healthy part of the aquarium's environment; it consumes nutrients that, if left to accumulate, can harm the fish. Only clean algae when it becomes a serious issue.
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Step 2
Apply an algae-scraper to the sides of your tank--one that doesn't damage your finish--and siphon or filter out the dislodged particles. Remove your aquarium's decorations and fake plants, wash them off thoroughly with cold water, and return them to the aquarium.
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Step 3
Do not scrub your aquarium until it is algae-free, but rather leave some behind: a totally-cleansed aquarium can actually produce algae even faster. Even after a good clean, a normal, healthy supply of algae should reassert itself after 2 weeks. If it returns faster than that, in mere days, then you need to reconsider the layout and structure of your aquarium.
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Step 4
Add some plants, if you haven't already. Plants will compete with the algae for nutrients.
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Step 5
Consider adding algae-eating fish--like plecostomus catfish--to your aquarium's population.
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Step 6
Change 10 percent of your water a week, to help prevent severe algae build-up.
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Step 7
Ensure that your aquarium avoids ideal algae-growing conditions. Check and clean your filter regularly; wash it out with water from the aquarium, to preserve the beneficial bacteria. Don't overfeed your fish (which leaves behind scraps), and avoid excessive sunlight.
