I saw a study a little bit ago where peppermint shrimp were found to feed on flatworms. I had the little harmless acoel flatworms in one of my tanks so, I figured why not give it a shot? There were hundreds of acoel flatworms on the glass. I put 3 peppermint shrimp in there and 2 days later couldn't find any FW at all. I left the shrimps in there for another month afterwards to make sure they finished the job, then I passed them on to a fellow hobbiest. I haven't seen any flatworms since. YMMV, it may be worth a shot though.
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