Here's an old shot I recently rediscovered. This is the blue-ring angel, Pomacanthus annularis.
Like other Pomacanthus species (ie P. paru in this earlier post) this species goes through a colour change. I saw loads of adults whilst in Asia but no juveniles but then I suppose the adults are more noticeable on account of being much bigger than most angels and quite friendly. The pure white of the tail with its orange fringing really set off the patterns on this species for me and I think thats why its one of my favourite angels.