i just resently got a silver aro and put him in my 55 but iwas going to put a pbass in there. can they go to gether?my aro is about 2 to3 in long and the pbass i want is about 2 in long.
I generally don't recommend any tank mates for baby arowana until they are at least 5-6" and even then only a select few tank mates until they are 10-11". You could give it a try the worst that could happen would be you having to buy another baby arowana.
my pbass ate some small aros, they are generally to agressive to have with small aros. as brian said wait till the aro is much larger. also check out the stickies.