Acan help...

[ashley]

So I have two scans and one is nice and extended and the other is closed...do I need to move it?

 

[Tahoe61]

Are you sure they are both Micromussa? Could one be Acanthastrea echinata, a pretty aggressive LPS?

Check out link below:
https://www.reef2reef.com/threads/acan-or-micromussa-how-do-you-tell-them-apart.11678/

And silly goose, what lighting type and an image is always helpful. :p