cyano tends to be one of the ones that you think you demolished and it just pops out of no where, primarily while treatment try to restrict it to as little an area as possible so it doesn't become a nuisance to you're corals,inverts,etc. other than that you're flow is most likely on the lower side, and cyano usually grows easily where theres an abundance of nutrients, might have to cut back on coral feedings for a bit while treating.
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