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I think you'll find this is actually a species of Toby (Canthigaster spp.)
Ahh kk, thanks Hix - the entrance to this exhibit had all the ID boards flashing on a single screen and we saw one for the puffer, which I thought was this fish as it looked puffer-ish shaped and had similar markings from what I remember [only got a quick glimpse of the ID, and fish isn't my strongest point]