Quoted from the Marine Center website:
Latin Name: Acanthurus japonicus. Common Name: Powder Brown Tang. Also known as Powder Brown Tang,
Goldrim Surgeonfish, Japanese Surgeonfish
Quoted from Wetwebmedia website:
Acanthurus (glaucopareius) nigricans (Linnaeus 1958), the Powder Brown or Gold-Rimmed Surgeon (and Whitecheek Surgeon to science), Cat Tang in Hawai'i.... The corrected scientific name of this species is A. nigricans (per Randall, 1988); a revision no doubt as unpopular to some as my labeling the species as "bad". The very similar A. japonicus is a far better aquarium fish; A. nigricans rarely lives for more than a few months in captivity, often, oh joy, bringing in parasitic Protozoan disease to take the rest of your fish livestock with them.
From my own & other reefer friends' experiences, the A. japonicus (with the bigger white markings) survives better.
Also, I've known several reefers (including those who posted their experience here on Canreef) who had the same fish for a over a year without adding anything new & no sign of ick, but when the fish were stressed (ie. heater died, power outage), their fish came down with ick despite 2 or 3 years without any ick present.
I find that ick-magnet fish like Powder browns, Powder blues & Porcupine puffers are easily stressed & so when something new happens, like a new fish is added, they are the first to have a few white specks appear.
Anthony