Welcome to Canreef, I have seen it at Wai's and Golds. Pretty sure it's cheaper at Golds though. I would try to wait it out first before using chemi clean. Reduce feeding and light period for a while and see if it goes away. I had a bad cyano outbreak and it was starting to cover my zoos and other corals. I used chemi clean and a couple days later it was gone. So it does the job.
HTH
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