Tiny microscopic flatworms in substrate?

[Microcosm Reefer]

I was checking on my pod population with a usb microscope and noticed these tiny wormlike specs moving on the substrate. They look like some kind of flatworm but has many ciliate like features. Trying to determine if these are just babies or adult form and if they may present a threat later down the road.

USB Microscope view ~25x magnification (too small to identify):

Slide under microscope 100x magnification:

 

[Greatreefer]

What about this?

Reefkeeping Magazine - Flatworms and Other "Bugs" That Make You See Red

Reefkeeping ...an online magazine for the marine aquarist.

www.reefkeeping.com

 

[Greatreefer]

Figure 2. Cell proliferation and cell migration in acoel flatworms....

Download scientific diagram | Cell proliferation and cell migration in acoel flatworms. Localization of BrdU-containing cells in the acoels Isodiametra pulchra, Neochildia fusca and Aphanostoma sp. after a short BrdU pulse (A-B, E-F, H) and 10 days chase (C-D, G). (A, C, E, G-H) wholemounts of...

www.researchgate.net

 

[Microcosm Reefer]

After exhaustive searching I think this is Pseudokeronopsidae.... link to post that clued me in:
https://www.reef2reef.com/threads/i...ke-on-paracanthurus-tang.808671/#post-8865073

Hope this helps someone else.

 

[cpsrqfl]

Do they look like this?