I also raised mine on Brine shrimp eggs, from a local shop. I also raised a pool of daphnea and when the fry were a bit bigger moved the daphnea into their pond, I had as many daphnea as fry at one point. But they will eventually eat them Free food. Helps as they eat so much.
A pestle and mortar might be needed, I ground my own big fish food up. Saki Hikari growth, and they loved that when they were a bit bigger.
I always mixed my food with Sansai Biorex and warm water. They in turn got dried blood worm and then also real blood worm.
Great to follow the thread though.
Agree egg makes the water bad, but the more food you put in the more water you got to change anyway. However you’d be surprised how hardy fry are. I had nitrite through the roof when mine first hatched and it took two weeks to get it down. I still had millions of fry. And seemingly not so many losses.