What is wrong with my plate coral?

[Dani1403]

I got home from work today and seen my plate is starting to decompose, it was open I moved it from my large tank into a smaller tank untill I work out the problem any help would be great I don't want to loose it, it's my favorite piece
This was taken today

 

[Dani1403]

This was before today

 

[Dani1403]

Hello anybody?

 

[turkeyty]

Is this a pagoda cup coral? It looks like in the second picture it was possibly too close to some leathers??? Have the polyps been fully extending? These are a relatively hardy coral and sometimes take a little while to get settled in.. Its hard to tell from pics, but it looks like the affected area was from being touched by a more "aggressive coral"... They usually recover easily... I would just place it in moderate flow and moderate light and give it time to recover... If the hurt area is rapidly expanding, you could look into a revive dip, although sometimes it is best to just isolate it away from the aggressive corals and give it time to heal... This is all said with the assumption of proper water parameters being in place... Hope that helps?

Ty

 

[gmate]

That's definitely a Pagoda Cup coral, not a plate coral. It looks as though it's been stung.