Help ID this flat worm? White body with split tail

[MoshJosh]

Saw this chilling on my glass this morning. . . at first I was like WOW a cool sea slug. . . but after some googling I think it is a flat worm? any ideas? bad, good, neutral???

 

[vetteguy53081]

Saw this chilling on my glass this morning. . . at first I was like WOW a cool sea slug. . . but after some googling I think it is a flat worm? any ideas? bad, good, neutral???

Clear pic(s) under white lighting will be helpful. There are many flatworm species out there

 

[MoshJosh]

Clear pic(s) under white lighting will be helpful. There are many flatworm species out there

Sorry took me a second to upload the pictures. . . unfortunately I was only able to get these two photos before it crawled away

 

[KrisReef]

I think it was a flat worm too.

 

[vetteguy53081]

Sorry took me a second to upload the pictures. . . unfortunately I was only able to get these two photos before it crawled away

pic fuzzy but look like acoel flat worm which is not a danger like red planaria but you want to remove ASAP.
The issue with these guys is in numbers, they can smother a coral(s) blocking the light that provides zooxanthellae which is their building blocks for color and energy/growth.
Remove by:
-Siphoning with a 3/8" tube

If a few, add a wrasse which will eat them such as :
6 line
yellow coris
lunare
melanurus

For next 10-14 days, look for presence of egg cluster which is Really tiny