Anyone have a proven flatworm (planaria) eater?

[des]

I have a 28g tank. Can't really keep a Mandarin goby, 2 different coris wrasses were disinterested, can't find a blue velvet sea slug, don't really believe a scooter blenny would hunt them. Anybody have any luck with a flatworm hunter?

[LuckySingh]

they say mystery wrasse do the job...

[CoryDude]

Melanurus wrasse is supposed to do the job. I've saw a LFS that had flatworms all over their display tank. They added 1 melanurus and the tank was clean only a week later.

[kkiel02]

I know its late but aren't 6 lines supposed to eat them?