the nudibranch you're referring to is called the velvet nudibranch. Although it chows down on flatworms like no tommorow, DO NOT get one!
They will quickly decimate the flatworm population then promptly starve or die off (they are fragile critters). When they go to nudi heaven, they take along your entire tank as they are quite toxic.
Why do you want a fish to eat them? Is there something in your tank that can't tolerate flatworm exit? or can you not find FE?
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