Can someone help ID?

[Grimreaperz]

I think it is a type of flat worm but am not sure it was about the size of a walnut in diameter, moved across the surface of the rock shaping to its every crevasse almost like someone moving a sheet across the rock. I got the best pics I could. I came back and saw it disappeared into a tiny hole.

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[TauntingBeef]

is it the brown or red thing your asking about

 

[SeaCucumberFan]

The thing in the middle is a flatworm

 

[Sugar Magnolia]

Polyclad flatworm. They eat snails and mollusks.

 

[Grimreaperz]

Crap....I have 7 trochus and 2 bumble bee snails. I can't find the 7th and I had one die the first time I put them in I wounder if he is the culprit. Do I just need to wait to see him again and take him out or is there a way to lure them out?

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[mcgyvr]

http://www.lionfishlair.com/hitchhiker.shtml

 

[AlSimmons]

You probably have to wait until you see it again to remove it. If you've got the time though, shine a flashlight in the tank at night. Who knows what you might find.