Any clue as to what this is?

[idgy]

It looks alien.

 

[Chichas01]

Looks like a pest anemone. Kill it.

 

[iroll253]

I dont know but it doesn't look friendly.

I would remove it. But its your call.

 

[hernluis]

It looks alien.

wow, i have never seen that

 

[Randy-S]

is it soft or is there a hard base?

 

[declivis]

looks like small majano (pest) anemone.........

 

[ajnweb]

Could it be a small plate coral, if it has a hard base????

 

[jake65]

Could it be a small plate coral, if it has a hard base????

+1 on that or a hidden cup coral of some sort assuming it has the hard base