Don't really see any type of pattern at all, it's just the way SPS are. Some do well, some don't. Some grow fast, others don't grow at all, and some fade away. Ideally, more grow than fade, but it depends on the coral, it's source, it's time and changes during shipping, it's new lighting, water chemistry and flow, available food in the water column, and on and on.
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Brad
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