All my fish I currently have in my DT are fully qt .. I have an opportunity to purchase more fish from a fellow hobbyist and he’s had these fish for 5 years or so no need additions of any kind .. so if is was to get these fish should I just do a observation for a few weeks and add them to my mains display or do what I normally do and copper and prazi them ? He did not qt them when he bought them but he said he has seen any signs of ick or flukes in the over 5 years he has had them .. and they are all tangs yellows powder blue scopas and white tail along with a foxface .. Tia