earthworms might work, my senegal loves them. Sometimes bichirs dont seem very concerned with eating though, and my large one either eats when im not around or fasts, I wouldnt be to concerned.
Also if you are really concerned and think it might starve, you could move it to another tank that your sure wouldnt have as much competition for food.
Finally, the coloration of your ornate is might be different now then before, due to the color of substrate you have, compared to the color of the tank's it used to be in.