hi im new to this forum and im not sure where this belongs. i guess i should have researched this stuff before i bought the rock... but i bought it and put it in my tank cause i thought it looked cool. anyhow ive looked over the internet to try to id these but have had no luck. can anyone help me out?
in the center of this pic. its just sticking outa portion. who know how much is hidden under that rock. it doesnt look like any worm that ive seen. possibly a sea cucumber?

heres another shot
i dont know what that reddish orange thing is in the center of this pic. maybe some type of anenome?
and i probably should have researched these muscles b4 i bought the rock but i thought it looked cool and got them... anyways anyone know what kind of muscles these are? and does anyone know what type of coral that is living on them?
and heres another shot of the same thing
any help/ comments are appreciated. thanks guys!