Xenia eating nudibranchs

[Jeffery Wang]

While watching some docummentaries on YouTube, I've stumbled upond a video of a Xenia eating nubranch, they look exactly like xenias. Can people keep these in their tanks and be able to sustain them with Xenia?

 

[user 26995]

hmm, that might explain why xenia all of a sudden in a matter of days, disappears.
Do you have a link to the video?