Go with some different shapes and it shouldn't matter too much about your tang being established. I have a 120 gal with 25 fish and few problems with them not getting along.
I recommend a royal gramma, yellow coris wrass, bi-color blenny, blue tang, a firefish and a pair of watchman gobies for the bottom. This mix will give some good colour and give you fish action in all levels of the tank. It definately does in mine and they are all very reef friendly IME.
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Greg
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