Chalice help.

[jerseypete]

I hade this chalice about a month now. And it seem like it's starting to go down hill.

this is the first day in the tank.

the next pic is today. This started like 2 days ago. I have about 5 other different chalice and all ok. Any ideas what this is. My parm are good.
Alk 8.2
Mag 1420
No3 2-5
No4 .05
Cal 430
The only thing I changed in the last week is I lowered the lights cause I added a few new frags. Cut down on the whites.

 

[jerseypete]

 

[jerseypete]

Don't know why it's posting second pic upside down. I mounted the chalice on this to keep sand off it. From gobi. That was done first week also.

 

[cloak]

What else do you have in your tank? FWIW, one of my Peppermint shrimp went rouge one night and did a number on my Miami Hurricane chalice.

 

[jerseypete]

I have a cleaner and a red fire shrimp. But they been in there for a year now and never had a problem with either.

 

[jerseypete]

these are my other ones they seem alright

 

[vic67]

I've had this happen with a few of my chalices. I moved them to another part of the tank and they recovered.