Duncan Coral Stem Browning??

[Levib.Lenhart]

Hi all! So I am still new to the hobby and recently inherited a new (to me) established reef tank. For the first few days my Duncan coral looked beautiful and was fully open. But starting yesterday afternoon it’s only opening about half way and the stem has brown on the lower part. I’m not sure if I’m just now noticing since it’s not fully open and I can see the stem now or what’s going on. Any ideas or tips would be helpful!
My parameters:
Am: 0.2 (I’m doing daily water changes to lower it)
Nitrite: 0
Nitrate: 17
pH: 7.8
Temp: 75° F
Spec. Grav: 1.026

 

[Coral Me Impressed]

Our tanks are dirty in comparison to the ocean. Typically the the skeleton is only white from new growth. Over time it will darken. As long as it's not the tissue it's nothing to worry about.

 

[DirkDigler]

Our tanks are dirty in comparison to the ocean. Typically the the skeleton is only white from new growth. Over time it will darken. As long as it's not the tissue it's nothing to worry about.

Thanks, late on this reply but dealing with the same situation. My Duncan is fully open but doesn't have the same color as before not as eye grabbing with it's green coloration. It is now more opaque in color but again...fully open.