Tiny flatworms, good or bad?

[Reefer Dan]

I’ve seen these crawling on the glass. I can’t figure out which kind of flatworms these are as they are tiny. Anyone able to ID?

 

[BostonReefer300]

I'm not sure based on the picture. Check out the pest identification sticky thread. Get a wrasse (not a fairy) and you'll never see anything like that again!

 

[Reefer Dan]

I'm not sure based on the picture. Check out the pest identification sticky thread. Get a wrasse (not a fairy) and you'll never see anything like that again!

I want able to find it on the sticky thread. Any other ideas?

 

[Reefer Dan]

Here are 2 microscope pic if that helps at all…

 

[Reefer Dan]

Bump. Still haven’t been able to ID them…. Found a bunch between the sand and glass.

 

[Cell]

I feel like the majority of flatworms we find in our reef tanks are undesirable for one reason or another. Even if they aren't coral eating, they can potentially multiply out of control.