Thanks all. A lot of hobbyists nowadays are getting more demanding and are expecting to see nice features on a juvenile fish due to the price they are paying. Which is pretty hard to convient anyone if I show them something like these.
In actual fact, these are the much younger siblings of the shown blue base crossback in the first post. As far as I can remember, that blue base crossback look exactly like the 1st pict I post in this post.
My humble advise for all arowana keepers is to give time for the little one to grow and develop and owner must too have faith in themselves.