Not really sure what you mean by control the algae.
6 to 8 hours with the lights on is usually sufficient to keep low demand plants healthy while keeping algae growth to a managable level. Its something you will have to find through trial and error, and you wont see any immediate changes. Change the lighting, see how things are in a couple of weeks, make further adjustments, review again in a couple of weeks etc.
Algae isnt normally a problem, it just looks unsightly.
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Aiken Drum
Community Moderator
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