He probably only has them in there temporarily, right pupol?
Anyway, it is a sight to behold, great colors, love them Achilles Tangs.
Seriously though, how are they all getting along? Seems like the aggression would be through the roof, or is the fact that their are so many in there that it actually cuts down on aggression?
Keeping the tank clean with decently low Nitrates and Phosphats has got to be a chore.
Please tell us more about the tank, how long has it been set up, filtration, what is the age of the oldest fish? Etc.
How long have you had the Achilles tangs for?
Thanks for sharing.