ID on zoa frag plug

[stevo01]

My Rastas frag of 4 little polyps fell out of its hole in some live rock, or more like pushed by a snail/hermit. When I picked it up had this guy moving around pretty fast. Also ever since I got this frag it gets these long feather things growing out of it. It's survived dips a couple times. And manual removal. So 2 ID's please.


Chiton?

not a good thing to have...

 

[pschrum4]

Looks like some sort of flatworm. Not sure if it is a threat but if you don't know what its capable of I would take it out for observation.

 

[stevo01]

I took it off the plug last night and I have it in a glass. It has a hard exoskeleton. Def not a worm. Still leaning towards a chiton or isopod.