Hi guys ... I have a tank consisting of

1) Rummies
2) Cardinals
3) Harlequins
4) SAEs
5) Otos
6) Platies
7) Yamatoes

Got 6 congo tetras ... was wondering if (due to its size) any one of my fishes or shrimps would turn out to be their tasty meal? Some say they might eat the yamatoes, but so far, yamatoes left untouched. There are some small yamatoes ( 1 cm) and big ones (3 cm). They are not even chasing any fishes. Opinions? Thanks in advance