chem clean works great on cyano , just turn off your skimmer first, Cyano is also very photosynthetic but dosent have alot of energy reserves thats why it goes away at night , a 3 day black out helps knock it back . Get the skimmer going again and see if it will skim out whatever the cyano is feeding on . Maybe test phosphates at night when you notice the cyano is gone and see if it spikes.
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