the blue colour morph of centropyge nox is a very rare variant.
no one knows the % of population with this colour.
it could very well be like, 2% of the population?
the thing is, although the colour is different from the normal, it's scientific name is still centropyge nox. so LFS will not dare to place orders for this "centropyge nox", because an entire shipment of normal black ones will come.
moreover, even if the supplier manages to find a blue one, it will go to japan. not singapore