Worm identification

[Bernardo Lamartine]

For the past few days I started to see some strange worms in my reef tank. The smallest that i saw was less than 1/4" and the biggest more than 1 1/2".
Some photos:
Median one: (in the back is a flipper nano):

Small one:

Thank you for the help

 

[reef lover]

Little cucumbers or medusa worms.

 

[Bernardo Lamartine]

Thank you, I did a little research and I think it is a medusa worm.