hi anakcili,
Some meds kill algae, some meds prevent it some sticking.
the ones that kill also kill a lot of other stuff including your fish/shrimp, bb[beneficial bacteria] and some sensitive plants.
different algae you have to use different method to cure.
So the question is what type of algae you want to treat,method of treatment you prefer and how much is your budget.
Warm regards
Stan Chung
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