Are these flatworms ?

[Katfish22]

I noticed these strange white strands coming from my coral and noticed the coral right above that has Actually lost polyps since I got it but has also spread so its like something's eating it, any suggestions?

 

[Katfish22]

Here you can see the coral I'm talking about that is now missing polyps

 

[Sniperhank]

Flatworms aren't normally zoa issues... Is suspect a nudibranch.

 

[Katfish22]

No the only other thing I could think is the snail that hitched a ride on one of the corals but it looks harmless, it has a flat shell or the little white starfish you find random in tanks as well

 

[Sniperhank]

Either way, a good idea is to dip your corals in something like coralRx to prevent such issues. Will knock off all kinds of bad guys that you don't want in the tank.