ugh i just dont think they "belong" in this tank even tho he doesnt bother them..
i agree salvinis for the most part will be very aggressive! beautiful but mean. Tiger barbs can be fin nippers unless in a big group of like 8 or more..Go with some larger tetras , giant danios , rainbows or some of the passive cichlids like severums,parrots,festivums.
If you really want the con to be the centerpiece of the tank, get a school of tetra and leave the other cichlids out.