IMO the obvious choice for a suitable ized tank is the yellow tang for the following reasons.
1. they are cheap and readily available so that you can choose a alert, fat, healthy one with clear eyes, free of spots or tears or reddening. One that is as interested in you as you are in it.
2. They are from Hawaii. Too many tangs are from the Philippines and Indonesia where the use of cyanide is rampant.
3. Provided that they are not in the same tank as one of their species or another yellow shaped fish like a lemon angel, they are relatively peaceful.
4. Feeding is easy and inexpensive. Nori soake with garlic extract and or selcon from time to time.
5. Although many have 'black ich", you can see it on the fish and it is treatable with a fresh water dip.
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