Well, to be fair, the little Crossback was imported when he was about 5.3¨ small. And the exporteur (Jeffrey Tan) told the importeur that he can try to select some Bluebase but he can not guarantee that they are really gonna turn out Bluebase because at the size around ~5¨ you can't really tell for 100% sure. The certificate says it's a Bluebase Crossback and the Arowana was bred by 'Wah Seah'.
After all I don't really care if he/she is Bluebase or not because I always "only" wanted a nice Crossback Arowana. BUT I can see some blue-ish shimmer depending on the light above him/her, although I'm not sure if thats normal for any Crossback or not.
He/she was in a WTT until he got exported, which was around 5 weeks ago.