I think I found out what this is.
Can it be Montipora Confusa?

Not a confusa, at least not like the ones I have.

EDIT: You know, you might be right, after looking at it more it does have similar charachteristics with a Confusa; however, Confusas usualy have much more brown/tan highlighted by intense green color. That specimen shows no such contrasting colors. Maybe it is a light adaptation response.

I have some other corals with light issues as well. That green piece I got from you has never done well the one with the long polyps. That green cap I got is doing great though, and that pink cats paw I can't get off the bottom of the tank it just bleaches every time I try.
So the color can be off a bit. Tank is not that old so it might come around.

There has been a few times were it was all green for a bit with the green covering the retracted polyps.