Duncan is closed and won’t open

[cruzreefs]

I was wondering if anyone could tell me if the Duncan is dead or what’s wrong with him I got him about a week ago it’s one of my first corals i got him but then had to go on a trip to Florida for a little over a week and when I came back he looked like this all of the other corals look good while I was gone I had a family member feeding and watching over the tank and he said the fish were messing with the Duncan and nipping at it we I got back last night I checked parameters and everything was fine except the ammonia was a little high so I did a water change to hopefully help it this picture was token about 10 mins after the light came on if anyone can help it would be greatly appreciated

 

[TX_REEF]

how is your flow and lighting? what equipment? what other corals do you have that are doing fine?

 

[Tommy B]

Duncans are good at being the canary in the coalmine, usually something off with water parameters if they close for extended periods.