i currently keep two very peaceful apisto. borelli's in a 10g with 2 cherry barbs, 2 harlequins, an american flagfish, and an otto....
I haven't observed any aggressive behavior towards the other tankmates.. even prior and after breeding... only SLIGHT aggression but there haven't been any damaged fins or dead fish...
The tank is heavily planted... so perhaps that's whats keeping the aggression down. Also, most apistos... if not all, like a planted tank...