All healthy aquariums contain a little bit of algae, but it can quickly become a nuisance. Algae can be controlled, though, by manual removal and by eliminating conditions favourable to its growth, such as too much light.
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Aquarium lighting needs to be reduced by at least 1 hour per day in order to slow down algae growth, according to "Freshwater Aquarium Problem Solver." Using a timer to turn the lights on and off will help keep lighting to a proper level.
Keep lights on for aquariums only 6 to 10 hours out of every 24. If the tank has live plants, however, it will need light 10 to 14 hours per day.
Aquariums near windows will grow more algae than aquariums that are not. If the aquarium cannot be moved, place a shade over the window to reduce sunlight, according to "Freshwater Aquarium Problem Solver."
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