white rings on my new zoathids

[justinb]

I recently purchased some zoathids on ebay. They came 2 days ago and now im starting to see a white ring on each polyp. i want to know if i should be worried or if i should do somthing to treat them

 

[justinb]

all my water prameters are fine, as you can see in the pictures, the polyps are trying to open, but only a few have fully opened

 

[Mike J.]

Welcome to Reef2Reef! I don't know what you mean by white rings? You might be worrying about nothing? They look okay for being new to the tank. What is the brown spot, upper right of picture? Could that be a Zoanthid Eating Nudibranch?