There actually are some predatory copepods but chances are the ones you got are just fine.
They live on detritus, phyto plankton and diatoms. They seem to do exceptionally well on diatoms actually which could be the reason that shortly after tank cycling is completed you have tons of them!
Then the massive diatom bloom goes away and you probably will never have the massive amount of pods again that you had in the beginning (after the diatom bloom) but there always should be some and they are good to have