I realize this is an old thread, my apologies it just seemed like a good place to put this question since slot has already been answered here.
I have 2 RB Pacus 12" & 10" currently residing in a 55gallon tank they've clearly outgrown. I've recently acquired a 150gallon tank to move them to with a fluval fx5 canister filter and all other obvious accessories. I am aware they will outgrow this tank also before long and intend to construct an indoor pond in my basement as a nice addition to my man cave.
My question is can the pacus get along with a 9" Oscar and the two 10" plecos that "came with the 150gallon tank " while I'm sure the plecos will be fine and I really have no emotional attachment to the Oscar (although he's a beautiful Oscar) the larger pacu is clearly a dominant fish constantly fighting with the smaller one unprovoked. It gets under my skin actually as the other one minds his own business and doesn't fight back when the larger one swims up and constantly nips him in the fish armpit.
Anyone have any experiences they could share?