Brown spot on Zoas. Something to worry about?

gunit

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So these Blue Hornets were opening up nicely for weeks, but then closed off. All my other Zoas seem happy as can be so maybe it is something to do with the brown spot I see in this picture?

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PRomero

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Or just blow it off with a turkey baster, it's actually beneficial to blow off the corals and rocks once a week.
 

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