Mine did the same for a bit..and still do. I find they will disapear for a week, only a few actually open and then all of a sudden they will be all puffed out like it's nobodies business. I think they might be sensitive to water changes, disturbances from tank mates.
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System: 30 gal, various soft and LPS coral. 3 powerheads, 96 watt light, backpack skimmer and a 1/13 HP cooler, running overtime. 1 anorexic Fuzzy Lionfish.
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