If you have fish you have enough nutrients for flatworms. To starve them out you'd have to remove all your fish. I've heard rumors that they can crash on their own, I've never seen it.
Flatworm Exit was a disaster for me, but if you're more careful than I was it should work OK. Basically multiply the number of flatworms you can see by a couple of hundred to get the true amount in your system.
I've heard that you can shine a light on the front of your tank over night the flatworms will congregate there, making it easier to siphon in the morning. I found this out after I treated with FW Exit, so I haven't tried it myself.
Six Line Wrasse didn't work for me. Cute little guy though.
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