What is this on SPS?

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Om84

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I bought a PC rainbow frag and it didn’t look happy to begin with when I got it.

There is a part of if where flesh looks like it’s coming off. The frag was dipped in Bayer. I was first concerned about AEFW but have not had any come off.

At some places you can see filaments coming out of the coral. Are these mesenterial filaments? Spinoid worm?

I just dipped the frag with coral dip for 5 minutes and nothing came off.

What should I do?

Half way into the video I take close up of what I'm talking about.

 
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Yes they look like normal filaments from stress and/or damage. The white spots with missing flesh look to me like the coral got banged up as part of the shipping or unpacking. If the coral is otherwise kept healthy should be just fine.
 
Mesenterial filaments, as noted above. Normal coral stress reaction. I've seen it when corals get too cold.
 
Thats a big frag! Good advice above.
 

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