Yah give the phosban a try. I've noticed in the 2 or 3 weeks i've been using it that the cyano takes longer to come back. But turning off the lights didn't completely get rid of the cyano.
I did my weekly 18gal WC last night. I took every zoa and held it in front of a pump to try and get the cyano off with not much luck. Ended up scrapping all my frags/colonies with the soft toothbrush. Man that took forever.
Do you have any PPE, RPE, NGs, or PDs? These are the only zoas that are not affected in my tank.
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