When and why not pull out the coral polyps?

What are you talking about? why would anyone want to pull out coral polyps?

Are you talking about "why are my coral's polyps not fully extended?"
 
Water flow, Water quality, some creatures in tank troubling coral, temperature fluctuations.
Lots of reasons for polyps ont extending.
The question was more clear in English than my answer would be in Italian. lol
 
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