If i was you i would only have 1 Blue Acara and then a pair of Bolivians, this way you will avoid the Acara getting aggressive over breeding aspects ie there wont be any eggs or fry as there would only be 1 Acara, Acaras can grown to about 8 inch, the Bolivains will max out at 3 inch so they wouldnt stand a chance aginst a pair of determind Acaras, however this is only my view other may differ.