Some kind of invert parasite?

[Instigate]

One of my emerald crabs got all these hairs on him and I didn't think much of it because it looked very similar to the normal hair on their legs. A couple days ago I found him dead on the sand. Wasn't really 100% sure if it was a molt or a carcass. There wasn't an opening in the back like the previous molts I had found but when I forced it open there wasn't much of anything inside. But it could have been there all day and maybe the cleaner shrimp got to it. Today I noticed a stomatella covered in the same hair stuff. Is it some kind of invert parasite? Also, I didn't see the "hairs" on the back of the corpse. If it was a corpse. I'm pretty sure it was.

So my cleaners have been releasing their babies today so I was searching around to see if I could find any and I found this. Is it the baby cleaner shrimp? I thought it looked similar to the hair on the inverts.

 

[Instigate]

Zanclea hydroid?

https://www.lionfishlair.com/hitchhikers-guide/

 

[najer]

I am inclined to say hydroid as well.