sick candy cane

[TheOtherGuy]

I have a Trumpet that was in my 20 gallon tank. At somepoint it must have fallen or got buried by my watchman goby. Months went by and then I found it buried. I looked at it and looked similar to what you are seeing on yours. I just set it back up and it recovered after a couple of weeks. As long as your tank is good overall water quality I think you will see it recover. Let us know how it does.

[Iknownothing]

Its a goner

[lachrimae]

I'd turn off the flow & spot feed those sun polyps. Try mysis or maybe even soaked Formula 2 pellets. As long as you can still see the mouth, they might take food. Feed them individually.
Don't just sprinkle Cyclopeeze around the area because they won't catch it, especially without the polyps fully extended.

If that doesn't work, some suggest pulling the frag up into a bowl of tank water once a day & giving it a food bath for 15 min or so. Try all sorts of food & see if anything works. (I wouldn't suggest disturbing the colony with this method unless spot feeding doesn't work)