So, more important than what you paid for these fish, what type of environment are they going to be inhabiting? What size tank? I have had each of these fish long term, the trickiest being a red sea regal. My Achille's resided in a 8 foot 300 gallon tank until its aggression became overwhelming. I am by no means "tang police", but you are doing the Achille's a disservice by keeping it in a tank less than 6' in length. Btw, kudos to utilizing QT process, you may want to add Prazi- pro to the med regimen. Good luck with your new additions.