Seems like a bit of new tank issues. I had the same thing on my 180 right after my diatoms set in. Manually removed daily, water changes and finally added a carbon/gfo reactor. I also adjusted my powerheads, added in sand snails and a sand star (who would touch the cyano and go the other way...lol) and a diamond back goby. While the goby didn't really do much with the cyano, he keeps the sand clean so that it does not have a chance to get going. Within a couple of weeks, it went away and has not returned. Patience and diligence, hopefully it clears pretty quickly for you.
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