Is this a feather worm?

Debra

Reefing newb
image.jpeg Hello, I am new to the hobby. My tank is 5 months running and I noticed a "creature" that I originally thought to be alge. I touched the edges of it and it retracts. Please forgive me if I do not know all the lingo. I have a Bachelor of Science in Nursing so I have a well rounded education. I am reading and trying to expand my knowledge base.
 
Thank you all for the information. I read that I can inject them ( I noticed another one) with scalding hot water. I'm a nurse so I am equipped with syringes an needles. Do you agree with this plan of attack?
 
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