Need help ID.

[mowgli.reef]

So I was just checking my tank while the lights are off and found these critters. Need help IDing.

They look like flatworms but fast and hides when light is on them.

 

[nautical_nathaniel]

They look like flatworms to me too. See if you can get a good still image of them for a more positive ID.

 

[mowgli.reef]

Found one in the glass.