Why pipe organ coral not open up normally

[ZhiYung]

Why my pipe organ coral not open up normally like a flower ? Is it because of the strong flow?
Alk 8dkh
Ca 410ppm
Mg 1200

 

[Reeferdood]

Strong flow could be the culprit, try moving it or turn back the flow and see if it responds.

 

[cristata.reef]

Some are picky. Mine took about 1.5 months to open in perfect water params and lowish flow. Didn't help that the hermit crabs kept breaking the superglue off either

 

[RegalMark]

I agree also consider Nitrate and Phosphate they like it quite low