THey'll be fine. Rams aren't piscivores, so they won't actively hunt the tetras as long as the tetras won't fit in the rams' mouths.
Hmmm... Is the bullying constant and very agressive , like niping at them and harrasing them, or just like chasing them off once in a while?My rams were bullied by these tetras, but now my rams bully them. My ram now, is being bullied by a male platy though...