Please help, 4 of these and still no idea what they are

[notjustcasual]

I started my tank a year ago and got some "free" livesand from Craig's list and a number of anonymous organisms along with. These guys have traversed the length and breadth of my tank , & I still have no idea what they are. Can anyone help?

 

[notjustcasual]

 

[omegasoldier123]

Lol! Looks like Majano Anemone to me. If so kill immediately. Maybe someone else will chime in. Look it up see if you agree.