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Have you waited the 5 day period after the 6 days of dosing? I usually cut my light cycle back to 3h White/Blue lights and 3h Blues (total 6 hours lights) during the 11 day treatment, turn off all UV, Ozone, pull absorbers, Carbon, Nitrate reactors. Nothing but Basic water care (Ca, Alk, Mg and trace elements that are premixed) goes in while I handle these types of issues. If it goes past two cycles, I would dose a diluted cycle of DinoX or fix the nutrient values in the tank causing the cyano.