if youre going to raise it alone, i've been adviced once by some very very experienced arowana keepers from singapore that aros tend to do better when raised in a smaller tank at first, lets say a 50, then gradually moving to bigger and bigger tanks. they say the aro will feed heartier coz it wont feel as intimidated by a big tank. asian arowanas are raised in growing up tanks before they are graduated to the a big permanent one. i tried this with my green. though i didnt do anything like this with my other aros, except with my jar which stayed first in a 60 coz i didnt have a bigger tank when i got him