25% ever 24 hours over three days then start pouring out the skimmer in the sink till it returns to normal. That's what I did anyways . I also blew my rocks off each time to get the dead stuff the cyano had suffocated into the siphon . Then cleaned any power heads , return pumps and glass.
Then have fun preventing it from coming back ...
I don't have a lick of algae but I still get carpets of cyano if I'm not carefull
Forgot to dip a frag a few weeks ago bam out break
I'm so sick of dosing that I just manually fight it.. Sick of loosing skimmers
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