I'm eying up a lovely silver Arowana, and once I'm sure I have some job security, And if by some act of god I get the algae in my tank under control. I will probably get one. 
I'm modifing my hood so prevent its likely escape. 
I'm only looking at a very small one less than $200...and yes I realise It will quickly out grow my tank, and someone on here will no doubt take him. 
 
Anything else I need to know about these little beauties? 
 
Oh I'm also aware that it will eat any small fish it can get its fins on. 
 
I see some Arowana are like 2K+, are they different than the silver ones? or is the big price tag because they are huge?