Most beneficial wrasse?

[Rosseau]

I am wondering what are the most beneficial wrasses (or other fish if they exist) to keeping unwanted hitch hikers under control.

i.e.
-nudibranchs
-pyramid snails


Thanks for any input.

[bkmorris]

depends on tank size, but if you have a moderate (~55g+) tank, i like the yellow coris. IME more peaceful than sixlines, don't get huge, and are good looking to boot. they actually aren't a true coris, that is just the common name. they are in the genus halichores.

HTH