Hey guys, I got this Ducan coral from a member about 8 months ago and it has been doing great and growing a lot in my tank. Then I got a Yellow Watchman Goby and he decided one night to bury the end of it in sand. By the time I really saw what was going on the end 3 heads were rotting away. I took the coral out as softly as I could to keep the rotted flesh with it so it wouldnt get everywhere. washed it and cleaned off as mush as i could. that was 2 days ago. Today I got up and see that another head of it is rotting. pictures are from this morning.

What should I do? do i need to frag off the healthy part to save something? I have never fragged Ducans before.

ducan1.jpg
ducan2.jpg