Any wrasse from the genus Halichoeres might eat flatworms as well as pyramidellid snails and bristle worms. Its not just restricted to six lines (Pseudocheilinus hexataenia). In the past I used a Halichoeres chrysus to clean what was left in a 50gal. At the moment I've got the same issue as you. Not flatworms but needing a wrasse that will not get eaten by my dwarf lion or eel. I opted for a Halichoeres ornatissimus because they grow much larger. I had it shipped from J&L earlier this week.
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