i currently have my 12" jar with a 13-14" silver, a bunch of indo dats ranging from 1.5-7", 2 different kinds of royal plecos 3-4", and a flagtail proc.
before i had it with a indo dats, flagtail, royal pleco, sexfaciatus, gold head comp., 6 discus, and 2 silver aros. this is when the jar was about 7-10". sold the other fish... he never killed any of the above fish listed. forgot to mention my mass tetra experiment... surprisingly majority of the tetras were eaten by the dats and barely any of them were touched by the jar.
before that size i had him with an angel fish, 3 L066 king tiger pleco, danios, 1" dats and regular pleco. he ate the danios, but ignored the rest
only victims to jar were feeders, danios, and some tetras through the lifespan of my jar so far