Looking at the fish you already have, you have a couple of very demanding guys already with the Moorish Idol and the Powder Blue. Wouldn't think the Achilles is any more demanding than them in terms of care. But like Miggsy says they do have a poor survival rate along with the Moorish Idol. They do need a lot of swimming space and are the more aggresive of the Tangs I think.
Nothing to do with the question but just wondered about your Moorish Idol? How long have you had it and is it eating well?? They are my favourite fish ever and am having a battle with myself about having one
