Sort of guessed it ever since you posted your collection thread. Quite a pair of popular name here in Asia.
I'm planning on naming my silver aro and black aro Ying and Yang too.
Planning on expanding since the top region is empty. Hence the term planning since if I have no arowanas yet, I cannot name them but I can decide what to name them once I get them.
Besides, my parents seem to be interested in arowanas, I could persuade them to sort of "adopt" them and help with the water bills