I had a pair many years ago. I fed them live waxworms as the main diet, occaisonally some flakes, and the odd moth around the house. The female was partially eaten alive by a leporinus, part of her abdomen was missing when I discovered the problem. She was full of eggs, apparently conditioned by the diet.
I read that the fry float when they hatch, and will only eat floating live food right in front of their nose. The author suggested netting some daphnia, and allowing them to partially dry out, so they would float and kick around at the surface of the water. It didn't seem like a very practical method for feeding/raising fry to me though... If the fry are large enough, maybe wingless fruit flies?