04-18-2009, 10:30 PM
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we'll need to know more about your tank. How old is it? What kind of water do you use for top-offs and water changes (tap water, or RO/DI water)? What are your water pararmeters, specifically nitrates and phosphates? How often do you feed? What kind of lights, and what is your light schedule? Give us as much info as possible, the more you give the more we'll be able to help
Light is only one part of the equation, algae requires light and nutrients to grow. If you aren't giving it too much light, then it's probably too much nutrients (nutrients is the problem WAY more often than too much light). To curb the algae growth, not only will you need to get rid of it's food source, but also figure out why it got too high to begin with, so the problem doesn't come up again in the future!