Wetmorella species are extremely peaceful. They will not bother any of their tankmates.
Sounds like a Possum Wrasses would be a great fit. Another option would be a Yellow Assessor.
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Do you mean the regular possum wrasse or the Tanaka?
The firefish is the most aggressive at this point. That tells you how mellow all these other fish are
Thats too funny! I've long said that it is a toss up between my Yellow Assessor and my Firefish for tank boss just to demonstrate how mellow my tank actually is.
Kinda surprising hearing that about a Yellow Assessor, I thought they could be a bit much? Or are they docile because they just don't care about other inhabitants.
Don't think I would go quite that far. When I had my 65 gal I had at one time three yellows and a single blue assessor along with a pair of clowns, a firefish and a tailspot blenny, everyone got along just fine and the assessors were always out in plain sight.
I had a flasher wrasse that was being bullied in my 210 at the time so I put him in the 65 with the assessors for some recovery time. Well all I can say is the assessors freaked out and hid the second that wrasse hit the tank and pretty much stayed that way till the wrasse was removed.
Assessors are among my favorite of all fish but docile tankmates are a must if you want to get the full benefit of keeping them.