I've never seen coral in the wild but in my tanks I'm taking inflated as a good sign and rolling with it. I can't think a deflated LPS is a sign of being happy but like I said I've never seen wild coral. I have seen a lot in tanks and they look pathetic deflated.Puffy just means it's reaching for light. Most corals in the wild are not inflated.
These were in my acro tank getting 300 par under two photons. I don't think they were reaching for light but maybe I'm wrong.
EDIT: These coral have been in several of my tanks but looked the happiest (most inflated) in the tank with high light and high flow but they did not get direct flow.
EDIT 2 Only because my curiosity is getting to me. Hopefully some LPS guru can chime in?
This coral is reaching for light?
But the same coral is now happy?
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