Pole wars again, hey don't derail the thread for the poor guy.
Hi Colefishing, let me just state it out for you,
you probably know the difference in price, juvenile colors of those Aros.
They have the same growth rate, same diet.
Same tank requirements, they grow as much as 3feet, some say 4, but that's exeptional really, haven't seen one but if there is, is there anyone kindly enough to post a pic?
Both are skittish, but Black's is much more skittish than any arowana's out there.
B.A. (They said) has some immunity developing D.E. but still, they can get it, or the S.A. they eventually will get it. Best chances to avoid it is to have em in a pond and control their diet.
So what I'm saying is, yes they can be housed within a 6x2x2, but really, for me it will look cramped and also to properly housed them you really have to go for 8x4x4 or better, larger or a pond...
For the Clown Knife, some have success stories regarding their stocks, but it boils down to the fish's personality.