Koles would be the hardiest and they are pretty docile. I noticed that most of the fish in your tank are pretty much bullet proof, excluding the mandarins picky eating habbits. If I were you, I would embrace the fact that I have a pretty easy to manage set up and go with a fish of equal hardines to the rest of the inhabbitants. Kole, yellow or even a convict would be my suggestion. I would stay away from any tangs with any blue on them IMO, they are weak to the ich and often bring it with them and foxfaces too can catch ich easily.
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