I.d. Of hitchhiker in my tank?

bobamike

New member
Sorry no pics, but I sawthis flat brown worm like thing about the size of a quarter behind my live rock structure just slithering across the sand really fast.and just as I saw it , it went behind a rock. It was completely flat, brown and almost oval shaped and moved reall fast. If anyone can tell me what it is and if it's a threat to my tank I would appreciate it.
 
Probably a polyclad flatworm. They prey on snails and mollusks so you'll want to remove it next time you see it.
 
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