Sorry i wa confused about u wrote. Thought u want to use them as feeders. They do get some height and girth. I have a feeling it will try to eat them. Keep the Senegalus well fed and will see what happens.
I had a Senegal attempt to eat a pictus cat that was about full grown, 6" and thicker than a dojo loach. I would not put it past the bichir to snack on the loaches