Mandarin + Melanurus Wrasse?

[lanamarks]

I was thinking about getting a melanurus wrasse to help with the flatworms in my tank (plus they are really pretty). My target mandarin doesn't mess with them at all.

However my mandarin is fat and happy and I would prefer to keep it that way. Would adding the wrasse be too much (i.e. not enough copepods to support them)?

FYI - tank is 100 gal and 3 yrs old. I am also considering adding a few clown gobies which will each some copepods but I don't think they are large enough to make a huge impact.