worm like things attached to macro

[MaxSmile]

Hello All,

Today I took out macro algae to clean and rinse and found these guys underneath the branches. they aren't moving actively and seem attached permanently to my macro. when trying to detach, they break and "head like" part stays on macro. Either it has mouth attached to macro or it grows into it. Help anyone? What are they?

 

[RedFrog211]

Might need photos in the water to see full extension/ animal; Best of luck!