You can try one even not with the one I am selling. My evil PBT hybrid leave my 2.5" and 4" alone since they are different species and this guys are not as timid as regular kole eye. Eventually I have to remove the 4" whitetail too along with other to lighten up my bioload when the regal, scribble, emperor and maybe small purple tang goes to the main tank later on.
If you still have your whitetail tang, I would like to purchase it. What other fishes are housed with the powder blue and does it attack them too or only the Achilles tang?