Duncan mouth open

[Reef man 89]

i picked up this Duncan coral about a week ago and from day one it has always been wide open only see it close up at night. But now I noticed that on one of the head the mouth is slightly open this is my first Duncan so idk if I should be concerned. I have a im40 fusion that's has been up and running for about 5 1/2 months my parameters seem to be fine
No3-5
Po4-.5
Dkh-9.5
Cal-440
Can someone give me a little insight as to if this is normal for this coral I have try looking it up but can't find much info on this matter thank you all for the help

 

[bios]

Normal and also good sign

 

[Reef man 89]

Normal and also good sign

Thank you I was pretty nervous

 

[Guss]

Normal and also good sign

Why is is a good sign what does it mean if u don't mind me asking

 

[Hincapiej4]

Why is is a good sign what does it mean if u don't mind me asking

Because it's a feeding response. If things are catching food and trying to eat, they are in good health.