white rings on my new zoathids

[justinb]

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

probably treat them with coralrx to be safe