Some Duncan tentacles look weird.. help?

[Emi2852]

Hey! So when I was looking at my corals today I noticed one a few of the Tentacles Of my Duncan they had a bubbly, bumpy appearance. I’m wondering if any of you could help me with what it is.

 

[Fishy212]

Looks like something took a bite out of it. I have Duncan’s and have not seen them like that. Any fishes or inverts that might be nipping at it?

 

[nick0206]

There is aiptasia next to my Duncan. When she stings him, his tentacles look the same.

 

[Emi2852]

Looks like something took a bite out of it. I have Duncan’s and have not seen them like that. Any fishes or inverts that might be nipping at it?

There’s no corals near my Duncan, and I don’t have any fish yet. I do have a billion Munnid Isopods that walk over everything and a few snails. Is it possible that the Duncan bit itself? I’ve seen some of his Tentacles in his mouth.. but I don’t know if he was putting food in his mouth or nibbling on himself...