The big difference I noticed with the blondes is the prominenceof yellow across the top of the face and top fin.
I have a regular one (who is awesome btw) and she has yellow on her face, but most of the blondes I have seen have a bright streak of yellow running from their face to their tail.
At one point I heard that this was actually the same species just a different color morph, but I don't know where the phylogeny stands now.
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