description, no pic.

[mr.clownfish]

i was staring into in my tank and was looking at the rocks. then i saw some antennas come out of a small hole. i thought it was a mini brittle starfish. and it slowly came out it was a worm with antennas it kinda looked like a caterpillar but with long antennas. it was blue and white stripes. it was really tiny like the size of a bristle worm. it came out for like 5 secs. one of the tentacles from my anemone touched it and it went into the hole it came out of in a blink of an eye.
what could it be?

 

[mr.clownfish]

it looks just like a blue spiny lobster but in the shape of a worm.

 

[meowzer]

Have you looked up different nudibranch's??

 

[mr.clownfish]

this was not a nudi. trust me. the first half of it looked exactly like a blue spiny lobster it was even the same colors. but it was elongated like a worm and it kinda looked like it had patches of white fuzzy hair on its sides kinda like a bristle worm. like a caterpillar. this is super hard to kind out with only a description, does anyone know a link for worm hitchhikers?