The Achilles Tang in general is not difficult to maintain in and of itself, but rather its needs are not normally able to be met in most Aquaria. For example, this Tang requires a tremendous amount of flow, chaotic in some areas. This results in a high oxygen content of the water, which again seems to be helpful with them. I have never had any issues with feeding, the normal Tang fare is fine. Concerning the ick issue, this is indicative again of need not being met, the fish stressing out, and then the ick ensues.
For example, I did pick up one of the 2 Achilles that were offered last week. The small (3.5") tang will go into a 100g tank with right below 10,000 gph flowing in and around through it via widely dispersed powerheads resulting in high flow in general, but some areas that could be considered chaotic. The SPS love it and I hope the Tang will too.
Take care!!