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A UV filter can help to control various sorts of algae that have free floating or swimming spores. The free floating portions get sucked into the UV, irradiated and killed and therby cannot attach anywhere. A friend of mine was having a green film algae problem in his fresh tank and installed a UV sterilizer and the problem disappeared almost overnight. Not sure if it would work on GHA.
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Remember, it will only get worse before it gets worse.
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