it really depends, in my tank, i have 3 ornates.
every month, i throw in some feeder fish (gold barbs, danios, guppies)
and once every so often, there will be a fish they dont eat (threw in 8 danios a couple month back, 7 got eaten, 1 survived. and its still alive today, despite numerous feeders have come and went) dunno why tho.
my senegalus is with an oscar, clown knife, pictus, 2 goldbarbs( feeders tat never got eaten ). used to have a pleco and guess what? it sucked on my senegalus so i sold it... same thing happened when i tried tiger whiptails...
a dat and a tyre track is keeping my ornates company, no problems so far... the ornates DID eat the 1st two tyre tracks...