If you're interested in historical data of Australian aquaria I can tell you, based on my photographs, SeaWorld had in June 2010:
Eyestripe Surgeonfish
Mimic Surgeonfish
Orangeband Surgeonfish
Whitecheek Surgeonfish
Bluespined Unicornfish
Orangespine Unicornfish
Whitemargin Unicornfish
Brushtail Tang
Pallette Tang (aka Blue Tang)
Sailfin Tang
A graphic also lists Convict Surgeonfish and Spotted Unicornfish, but I don't have any photos of them.
And I have photographed at Sydney Aquarium:
Bluespine Unicornfish, Palette Tang and Sailfin Tang in 2011;
Bignose Unicornfish, Orangeband Surgeonfish, Orangespine Unicornfish, Palette Tang, Powderblue Surgeonfish, Yellow Tang and Yellowfin Surgeonfish in 2009.
They also had a label for the Japanese Surgeonfish, Convict Surgeonfish, Spotted Unicornfish, and the Brown Surgeonfish in 2009 but I don't have photo records of them.
At Oceanworld (aka Manly Marineland) I have a photograph of a Palette Tang from 2009.
The National Zoo and Aquarium in Canberra also had Palette Tang, and Orangeband Surgeonfish in 2007; and Powderblue Surgeonfish in 2009.
Melbourne Aquarium in 2010 had Bulbnosed Unicornfish, juvenile Orangeband Surgeonfish, Orangespine Unicornfish and Sailfin Tang.

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Eyestripe Surgeonfish
Mimic Surgeonfish
Orangeband Surgeonfish
Whitecheek Surgeonfish
Bluespined Unicornfish
Orangespine Unicornfish
Whitemargin Unicornfish
Brushtail Tang
Pallette Tang (aka Blue Tang)
Sailfin Tang
A graphic also lists Convict Surgeonfish and Spotted Unicornfish, but I don't have any photos of them.
And I have photographed at Sydney Aquarium:
Bluespine Unicornfish, Palette Tang and Sailfin Tang in 2011;
Bignose Unicornfish, Orangeband Surgeonfish, Orangespine Unicornfish, Palette Tang, Powderblue Surgeonfish, Yellow Tang and Yellowfin Surgeonfish in 2009.
They also had a label for the Japanese Surgeonfish, Convict Surgeonfish, Spotted Unicornfish, and the Brown Surgeonfish in 2009 but I don't have photo records of them.
At Oceanworld (aka Manly Marineland) I have a photograph of a Palette Tang from 2009.
The National Zoo and Aquarium in Canberra also had Palette Tang, and Orangeband Surgeonfish in 2007; and Powderblue Surgeonfish in 2009.
Melbourne Aquarium in 2010 had Bulbnosed Unicornfish, juvenile Orangeband Surgeonfish, Orangespine Unicornfish and Sailfin Tang.
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