FWIW,
I have a colony of "mean greens" that shrivel up to almost pin head polyps, and they always do this.. and always return back to the same plump polyps. I THINK they do this when new polyps are forming/growing. This has been my observation anyhow.
Scott
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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