I'd like to share a slightly different perspective on A. achilles.
I recently attended an Hawaiian luau and was told beforehand that fish would be served (any idea where this is headed?). I was given a plate with a large fish wrapped in aluminum foil. When I gingerly peeled back the foil from the still steaming fish (cooked in foil over hot lava rocks), I was shocked - a whole and still beautiful 10" Achilles tang. My first thought was "I'm not going to eat this!" Pangs of hunder soon grew, and I was getting suspicious looks from the host (What, you no like Hawaiian food?). With a fair amount of guilt, I peeled back the dark skin and found a off-white flesh.
To the degree that I could, I must admit I enjoyed it. One of a few aquarists who has dealt with both feeding and eating issues with A. achilles, I suppose.
Dana