same with tangs the sizes you listed above are the very biggest specimens recorded in the WILDThat said tang is currently 4” and loving life. This species rarely gets 6-7” even in the wild let alone in captivity.
The fish I have have slow growth rates that they rarely even get close to 10” the CBB is likely going to get to 6” but that’s likely to be 5 years from now. They almost never get to 8”.
The Majestic and Regal yes will likely get 5-6” but not 10” as their growth rates are that slow, if you see a 10” of either of these species it’s a wild specimen that has likely lives for 30-40 years.