An old toothbrush does a good job on most forms of algae on live rock.
Making an inhospitable environment (i.e. clean water) is the best way to cure the problem longer term.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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