Flatworms, wondering whether to treat or ignore.

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Lately I noticed some flatworms in my reef tank. There aren't very many of them.

On the one hand I figure ignore them if they are not causing problems.

On the other hand, if I wait until they get out of control, they can cause more problems with toxin release if and when I finally treat them.

I am not to eager to use Flatworm Exit because I am worried it might affect my anemone and my feather duster worm.

My Mandarin doesn't eat them, my Copperband ignores them. A wrasse might not be a good idea because my tank is fully stocked and the Mandarin and Copperband already compete for pods.

Anyway I am just looking for input on whether to nuke them or leave them alone.