In regards to feeding feces, I have done this with hatchling ornates and sudanese in the past. What I did was just their first 1 to 2 days of hatching. I made sure I crushed it up into very small pieces so they didn't have any issues swallowing it.

I have a photo below but it isn't the greatest shot. My one group of Sudanese a few years ago wouldn't start eating greens until they had that special first meal.