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A micron filter will do just as well, and is cheaper than a diatom, and you can keep a micron filter on constantly. If it is green algae.
If you look from the side of the tank, down the length, does it look green or white? If it is more whitish, chances are you have a bacteria bloom and not algae.
How long as the tank been running for?
I would check all of your properties. Nitrate, Ammonia, Nitrite, PH, KH, and Phosphates. It will give you a better idea on how much water you need to change; but without seeing it I would do a 25% per week change until things clear up.
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