Critter ID: worm on glass?

[Vikora]

Im always intrigued with the weird critters. This came out of the rock bed after feeding the fish. Seems to have 2 segments separated with a white strip. If I had to guess maybe 5mm long. It was snapping at copepods if they got too close to it.
Thanks in advance!

 

[WalkerLovesTheOcean]

Bump!

 

[Goaway]

Im guessing, flatworm of some species.. anyhow, ev3n if not a flatworm. If its snapping at pods. I'd flush it. Pods are far more valuable than a worm that eats them.

 

[ISpeakForTheSeas]

Seems to have 2 segments separated with a white strip.

The two segments leaves me wondering if it has a shell/partial shell hidden under the flesh there, as it looks pretty similar to some headshield slugs and bubble snails.

Regardless, +1 to Goaway's comment - if it's snapping at pods, it's probably not a keeper.