well arrowans are like oscars, they will eat anything that fits into its mouth, 150 gal probably isn't big enough tank to have 2 fish if one is an arrowana. but if you wanted to try something maybe an oscar will be a good friend, or you could get a pleco. f i think of something else i will post and make sure your tank is covered or it will jump out and when it gets big you might have to kinda weigh the covers down so it can't jump and move them
deff get a baby, they are already an expensive fish and if you buy an adult then ts friend will have to be an adult, half the hobby is starting fresh and watching your fish grow.
get some fake plants that are as high as the tank they like to swim and will help with its confidence
This post was edited by dewy2015 on Jan 1 2015 10:41pm