01-21-2011, 08:01 PM
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Ignoring for the moment the algae and concentrating only on the water itself: is it green in colour, or white? If it is green, that is what we term green water caused by suspending unicellular algae, and reducing the light plus water changes will work to remove it. Also, ensuring the nutrients are minimal--overfeeding and overcrowding can contribute.
If the water is whitish or cloudy but not green tinted, it may be a bacterial bloom, and water changes will make this worse. Let it settle out naturally, it will disappear.