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bannerfish like all butterflyfish can and will sometimes be picky eaters, though they are one of the members of the family most suited to aquarium life.
i believe they are pretty hardly. AKA the poor mans idol (generally because they are cheaper, hardier and have more appetite than the moorish idol) i think you'd be okay just make sure you see them feed at the LFS
I am looking to get one of these guys in the near future. I was always under the impression that they are known for hardiness. My only problem is that I don't have a QT and my current fish have been with me for a while. Are Heni's very prone to ich, or are they more on the bullet proof side of the spectrum???