Ive had my cichla on prepared from day one when they were under 1 inch.
You can starve them boosten

Just not at juvie stage.
If you are having problems getting them on prepared at juvie stage then grow them out a bit and then start the starving method.
Another method to get them off live is to throw food into the tank as if its alive and moving. The cichla may come up and hit it from the surface. I never had success with this though.
I had my cichla on pellets for a while but then found it cheaper to just feed food like whitebait, krill, beefheart and bloodworms. It also pumps them up faster.
I got my cichla on pellets by using a red coloured pellet soaked in beefheart. This is because at the time the only thing they were eating was small pieces of beefheart. The cichla thought the red pellets was beefheart and ate them. I dont know if this will work or I was just lucky