Strange thing in my frogspawn

i'm sure i have seen this thin on my frogspawn move its very well camoflaged though, is it normal or some parasite? the coral seems fine

 

Some type of flatworm.

 

Maybe it's the mouth? Mine have mouth like things that look similar...

 

The mouth is a open or seeable crevice, this is not, but thanks for the idea.

 

Huum could be a acoel worm I think its called ,Its in the flatworm group but the most of these types are harmless I have had them to show up ebvery now and then a 6 line wrasse will take care of them .Or you could just dip the coral ? But watch for it to look stressed as that photo makes it really hard to be 100% sure ..

 

Here you go just took a pic of the frogspawn under my new halides, thanks for the replys so far.

 

either a flatworm or a nudibranch...hopefully its the flatworm...