What is it?

[hyla84]

Just found on the base of a catalaphyllia...
Just in case i removed it and it spit.. In the picture they are two

 

[Mikedawg]

I would research flatworms; good luck identifying this.

 

[reef lover]

Polyclad flatworms remove dip and repeat for at least a couple weeks.

 

[hyla84]

Dip in what? Just this coral? I'm quite scared that is gonna expand

 

[reef lover]

Polyclad generally go after lps so i would check and dip any you have in coral rx or bayer.