I'm planning to get a group of 4 or 5 anthias myself (bartletts or carberryi are my faves at the moment), but they will go into a 125gal long.
You could opt to just keep one, but I think a pair would be destined to become two males and duke it out. Three might work out, but add another fish or more, and chances of success improve. Ultimately space and distribution of aggression is key.
There may also be so-called tricks to introducing them to hopefully improve success. As to how effective it really is, it may be anecdotal evidence rather than anything actually proven.
I recently tried to pair up two melanurus wrasses and had no luck. One was an obvious male (but young), the other was a juvi female. In a matter of days in the 125gal tank, the 'female' started taking on a male attitude, and even started changing to male colors I had to separate them due to the war that broke out... so now I have one in each of my displays. Going into that though, I knew of that possibility and was ok with that end result. Though it sure was disappointing.
The cool thing though.. the former 'female' of the two is now displaying even though it is the only wrasse in the tank. I come home to it doing it's dance most evenings. Its pretty cool.
Sorry for digressing there
Keep thing is mind though, one persons experience isn't necessarily going to be the same as someone else. Fish will be fish.
