lemon
why would a powder BLUE tang look brown in the first place???
they don't look weird for sure....
i think u are confused.....
the PBT for sale might be a cross between a powder brown/black (Acanthurus) or perhaps a natural occurring rare colouration, hence called a hybrid....
this not the first time a hybrid PBT has been seen for sale in SG....
it's also not a 1 off....