Is this flatworm?

[thakki]

Looks like flatworm to me...but moves little faster like a pod...not in my tank...came with a frag i just bought...what is it?

 

 

[Origami]

Looks like a Flatworm. What kind of frag did it ride in on? Are there bite marks (or eggs) on the frag and is this in your tank or did it come off when you dipped the frag?

 

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[thakki]

It came on a zoa frag...not in my tank...just came out when I dipped in coralrx

 

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[thakki]

But they were moving fast with a sudden movement...more like pods.

 

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[gmerek2]

I can never tell what is abandoning my frags during the dip

[thakki]

Looks more like copepod or ostracod to me after spending sometime online.

 

http://www.lionfishlair.com/hitchhikers-guide/

[Zaphodent]

Doesn't look like flatworms to me

[Origami]

Unfortunately, you really need a better picture that shows more detail. We're all guessing, otherwise, based on a few blurry shadows. Copepods are (structurally) fairly complex animals. Flatworms are typically very simple. The fact that you saw it moving "fast" probably leans away from a flatworm. 

[SirLord]

Looks like some type of Isopod to me.