Of course, individual fish have individual personalities.
I think Apistograma trifasciata are a very good choice ...
I have to respectfully disagree. The OP asked about peaceful apistos, not easily bred apistos. For it's size, in my experiences, it is more aggressive than many other species. For me, this is a species that needs to be kept at least in trios and in more spacious tanks (20Long/29High 75X30cm minimum).