Wrasse in 20 gallon

Don't get a sixline, it'll probably bully the firefish and really needs more space. Get a possum or pink streaked instead.

Any wrasse should snack on worms to some extent, but is unlikely to remove all bristleworms from your tank. You don't want those removed, anyway, they're beneficial detritivores and you shouldn't remove them without a good replacement.
 
+1 for Pink Streaked Wrasse

have had mine for over a year in a 20 AIO with a pair of clowns. No issues at all.
 

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