If using peroxide, I believe the recommended dose is around 75 mg/L, but you may want to verify that if you decide to go that route. There are some algaecides you can use, but you may need to id the algae that you're dealing with for the best treatment. I've never had to deal with algae so sorry I couldn't be of more help. Try posting a pic and that may help others advise you on the best method.
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