The coral does not open! Need help, please!

[Masonvo]

I have had it for 4 days but it does not open, I put it right in the middle of my 30 gl tank, with 165w led light on 50% blue, 30% white intensity. Thank you!

 

[AlSimmons]

For an Acanthastrea echinata it looks ok to me. You might want to check it out a few hours after the lights have gone off though.