Most hobbyists don't have problems with their chaeto until after 10 doses from what I have gathered in this thread. My concern would be that your chaeto is infested with the algae as well and would re-inoculate the tank after treating with AF.
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Cliff Babcock
Intestests: Digital Microscopy; Marine Pest Control; Marine Plants & Macroalgae
Current Tank Info: 180 g. mixed reef system
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