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#1
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stop the algae from growing at all.
It would be better to stop the algae from growing at all. Where is the algae growing ?
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#2
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Please! Algae is you friend. Without algae you have a problem with hydroponics. Have you ever seen a healthy stream in the wilderness without algae. Algae means that their is nutrients in the water that your plants need. It only becomes a problem when it gets so bad that it covers the top of your medium and prevents oxygen from being suck into the medium when the water drains from the cups.
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