what is this worm...hangs out in star polyp?

[reeferchief]

Here is the critter in concern. It has been on star polyp since I got it and has caused no harm that I can see. He has got bigger and lately ventures out of the star polyp.

 

[bang guy]

It's a flatworm. I wouldn't put it back in.

 

[reeferchief]

Thank you. I was fine with him in the polyp but not sure about him wandering now. What kind of damage or harm can he cause?

 

[bang guy]

That one is a predator and will eat just about any animal it can catch other than coral. It will mostly eat snails and worms.

 

[reeferchief]

I got him out. Thank you!

 

[otherunderbrink]

Did it have antennae? And a mottled tan and back? I thought I saw the antenna in the first pic...

 

[reeferchief]

They looked like 2 black eyes...