Creepy white thing

[Swimzebras]

I saw a head pop out of my rock this morning and though "ooh an amphipod!" but then it stretched out at least three inched and sniffed around! Any ideas?

 

[XxVooDooxX]

More of a description or photo would be helpful

Sent from my iPhone using Aquarium

 

[Swimzebras]

Almost like a marine caterpillar, except thin and with a bug/amphipod shaped head, white. No visible legs on body, has a tunnel in the rock

 

[XxVooDooxX]

Can you try to get a photo?

Sent from my iPhone using Aquarium

 

[Swimzebras]

Here you go! White dot in the middle