Randy Holmes-Farley
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My Tank Thread
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What it boils down to is lights and nutrients. Minimize the light spectrum that algae loves, and minimized the nutrients in the water and the algae will slowly go away. I also recommend doing 25% weekly water changes for about a month or two, and not adding any supplements at all. Anything that adds nutrients to the water will give algae something to feed off of. Yes, a bit extreme, but this is how I was able to completely eliminate green hair algae in my tank.
But if you have high light requiring organisms, reducing the light may not be desirable.
There are many ways to reduce nutrients, and water changes are not, IMO, necessarily the best way. It is especially poor for phosphate, where even a 100% water change may not reduce phosphate adequately. Water changes can obviously be helpful, however.
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