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Cloves won't open

They may be in too much flow (try a low flow area). Cyanobacteria may be irritating their exterior (blow off the corals with a baster). They may be seeing too much light (lower them in the tank or place in a darker area). The water conditions are a little too clean for them (I don't know what to try there except reduce skimming on time). The parameters might be quite a bit different from their last tank (check parameters or change water). They may be feeling chemical warfare from other corals (use or replace carbon in the tank or change some water). Or, my personal favorite, they are shy, and they don't want their picture taken for November's picture of the month (tell them that it is the Zoa's turn).
 
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