You gotta decide how much you care.... But wrasse are active swimmers and really need some decent water space to swim in (not as much as tang, but still a good pile of water). I'd vote that putting a 6 line wrasse in such a tank for the long term would be relatively inhumane.
Sorry if that isn't the sort of opinion you'd want, but I gotta be honest about it....
Now, if you put it in with the intention of moving it to another tank after 2-3-4 weeks or so, then I'd say that's less of a big deal.