Duncan stalks turning brown

[silverado61]

I have two attached Duncan stalks shaped in a "V". One is longer than the other. The shorter one has one polyp. the longer one has 5 polyps which seem to be growing their own stalks. The main stalk on the longer one is starting to turn brown. Ammonia is zero. Nitrites are zero. Nitrates are 10. Phosphates are zero. It's a 75g tank.

My stock list is:
1- large pinstripe legged hermit
1- decorator tuxedo
1- Emerald Crab
2- Peppermint Shrimp
1- Reef Lobster
60- assorted Snails
5- Corals. None of which are anywhere near the effected coral
3- Serpent Stars.

Ideas anyone?

 

[silverado61]

Anyone???

 

[Eckolancer]

Pics?

 

[luistovarz]

Hey silverado6, hope all is well! I am having a similar issue with my Duncan coral, where the stalk is starting to turn brown, and I am hoping you can shed some light on this issue as I can’t find much info on this online. Thank you, and happy reefing!