If by WTT you mean placing the fish in a white-tank, causing the fish to try to blend to the brighter background.But here's my point: many say that WTT effects will go away after the Aro later has a darker background. This has not happened at all with mine, it's still just as shiny/crossed (if not more) over the 7 months since I changed from WTT.
I can confirm something similar with my previous pair of fire eels, whom were raised on a bright coloured sand and therefore became a light grey colour to match.
Even after being moved to a much darker substrate they retained that grey colouring vs. typical fire eel dark grey/black.
Not exactly the same as an Asian Aro, but thought I'd put out a similar colouring experience.