Do you know how many gallons that is (72?)? Just wondering. I had an acara a while ago and he lived just fine with some spotted pictus. Otherwise rainbows, giant danios, or any slightly larger fast fish would probably be ok.
You would need a big tank for the uaru, bc they get big and they are schooling fish.
My brother has severums, a firemouth, a krib, and a rainbow cichlid with his acara. You could also put uarus and choclate cichlids. Festivums would work too, pretty much just any medium aggressive cichlid.
thanks . the tank is 260lts about 52 gal. just filled it for the first time this weekend , very cool , got a piece of curio wood which is 2.8 foot wide by 1 foot high as a centre piece .