08-01-2011, 10:30 AM
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How old is the tank? Any fish? Brown algae (diatoms) are a common occurrence in a cycling tank and usually a sign of high nutrients in the water. Check your parameters, especially nitrate and phosphate, and do a water change if needed and otherwise, brown algae usually goes away as fast as it appears. If your lights are old, that could be an issue as well. Diatoms actually grow in dim light so if the tank is not well lit or your lights are going bad, that could be part of the problem as well.
Last edited by Nubster; 08-01-2011 at 10:34 AM..