Depends on what algae you have .... 2-3 days works for the green algae, but it took 7-10 days to make a dent in my BBA! 
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80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.
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