Gorgo Polyps retract/bumpy

Ido1

New member
What's the difference between the two?
Is it a way to differ between Photosynthetic and non-photosynthetic (Azoox and zoox) gorgos?

Thanks :)
 
It just helps narrow down the ID. Some can retract completely leaving a smooth surface, as where some cannot. Either can be photo of NPS.
 
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