Wild Nudibranch or Sacoglossan?

[strich]

Pretty sure this guy hitchhiked from some recent beach foraging I did. Currently in the sump with macro algae so I'm hoping he is a Sacoglossan and will live, and not a nudibranch who will eventually starve I imagine.

Video: https://photos.app.goo.gl/PyDdECard4agbrzg6

 

[EnterName]

Looks like it has very prominent and dense cerata on the back. That would be an indicator for a potential Aeolid (Clade: Aeolidida) so a Nudibranch.

Do you happen to have an image from it's back?

 

[strich]

Looks like it has very prominent and dense cerata on the back. That would be an indicator for a potential Aeolid (Clade: Aeolidida) so a Nudibranch.

Do you happen to have an image from it's back?

Unfortunately I did not. I will do so next time I see him.

 

[EnterName]

Looks like it has very prominent and dense cerata on the back. That would be an indicator for a potential Aeolid (Clade: Aeolidida) so a Nudibranch.

Do you happen to have an image from it's back?

Unfortunately I did not. I will do so next time I see him.

Too bad, but maybe you will see it again.
Most nudibranchs have very specific diets we can't meet in our tanks long-term so I'm afraid it won't stay for long. There are a few bad ones that eat corals though, so it might be best to take it out, put it into a small container, take a few good pictures and hope the community can identify it before putting it back or getting rid of it.

I'm not really good at identifying them especially since they tend to change color based on diet and many look similar... Someone like ISpeakForTheSeas might be able to help. His identification skills are insane.

 

[strich]

Update! I did manage to catch a quick look at the top side, but was unable to catch him:

Short video of him moving off: https://photos.app.goo.gl/M87PiP9CYhrsjWYv5

 

[strich]

Here is a much better video: https://photos.app.goo.gl/So9MFu1urNR8k9uTA

Anyone able to positively identify? Should I put him in the display ?
@ISpeakForTheSeas