Anemone id

[ofisx]

hi. Can u help me? What is this

 

[Gumbies R Us]

Is this a hitchhiker, or did you buy it? It's hard to tell what it is from the pictures

 

[OrionN]

Not enough detail to ID

 

[ofisx]

 

[ofisx]

I'm sure it's an anemone. But he must have come as a very young hitchhiker. currently no more than 1cm. How long does it take for it to grow and how should I feed it? Can I give it artemia?