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 To add to the above list:- try reducting feeding
 - reduce your photo period until it dies down
 - additional clean up crew members
 - increase water quality, maybe going to RO/DI, if you aren't already on it
 
 I'm battling the stuff myself and so far nothing is working. I'm currently trying a blackout period. For the weekend I'm keeping all the lights off and towels over the tank to prevent any light from feeding the algae.
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