If you look at most compatibility charts, 6 lines are compatible with all except another wrasse. Don't believe them. True, the 6 line will definitely fight another wrasse, but it can pick fights with any other fish at any other time. This is the one fish I wish I never got. There are a lot of prettier wrasses out there. Don't get the 6 line.
6 lines do eat pods, in addition to eating other sand and rock critters like brittle stars and worms. My 6 line does, however, get along fine with my invertebrates.