Weird grub/worm looking thing with tentacles

[Tathamet]

Hey everyone

So I was feeding my tank tonight and noticed a 1 inch ish tentacle come out from under one of my frags. I picked up the frag plug and flipped it over to see this weird black and white grub looking thing sitting there.

The back black part looks like a wriggly grub with Michelin man like ridges. The front white part is spiny or maybe bristle worm looking with two long tentacles at the very front. I thought it was a spionid worm at first but I’ve never seen them outside of their sand tubes. Is this what they look like?

I sucked it up with my coral feeder and took some pictures of it with a magnifying glass. sorry if the quality and lighting isn’t great. Couldn’t find a decent light to put it under lol.

 

[vetteguy53081]

Looks like some sort of grub pupae and not sure if its' even aquatic ????
resembles a nudibranch but nudibranch dont have such tubes

 

[Tathamet]

Looks like some sort of grub pupae and not sure if its' even aquatic ????
resembles a nudibranch but nudibranch dont have such tubes

I did think the front resembled a nudibranch as well but yeah the tentacles and grub like tail are throwing me off

 

[Tathamet]

Bump

 

[Eagle_Steve]

@KJ May be able to ID.

 

[KJ]

Spionid worm.

 

[Tathamet]

Spionid worm.

thanks!