for a long time I've got 6 awesome tangs,
achilles
leusternon
japonicus
xanthurum
flavescens (got the age of 16 years)
veliferum
but after adding 2 cleaning fishes, they all died...One of the new fish was sick...I didn't knew this at that time, after a few day's he got a big open wound and the sickness killed them all in 24 hours.
My tank stays 65 day's without fish, thought the sickness and Ich. would go away.
at this moment I got an tentennii, a real sweet en nice fish, never fight with the other ones.
my lovely gemmatum, because I've been waiting for more than 3 years to get her
a young species flavescens, scare for everybody and everything.
and than we got my blue devil, xanthurum, also a young species, but a real nasty guy.
Last summer, a friend gave my a achilles for my birthday, for 7 weeks no problems, and just from one to the other day the xanthurum want the achlilles out of his tank...2 day's later my sweet gemmatum started to fight also with the achilles...so I put him out of the tank and found a good house for him....
my opinion: zebrosama's a are agressiver as the acanthurus species, and the xanthurum is the most agressive of all the zebrasoma's
on this link you can see all my 9 tangs
http://www.zee-aquarium.nl/contents/acanthurus.html
gr.
Maya