I dont know what this is

[Icey88]

Please help me ID this . not sure if its bad for my tank
View attachment 343707

 

[Dkuhlmann]

Really hard to tell from the picture as it's kinda tiny but could be either majano or aiptasia type anemones or could be some type of polyps. A better picture might help for a positive ID

 

[Lilbitreefer]

Looks like aphasia. Poke it does it disappear into the rock? are there bands on it's tentacles?