Issue with Beautiful Chalice

[John Minnix]

Hello,

I have a beautiful watermelon chalice I've grown from a small frag. It's now about seven inches long and four inches wide. I noticed a brown spot developed a few weeks ago. It seems to have spread with this white portions. Any suggestions on how I can save this chalice? Thanks for your help.

 

[nanonøkk]

parameters might help and it looks like some kind of tissue necrosis or something grown on it or on its skeleton