I give my fish veggies or live foods every day, protein is important for growing fish!
I'd recommend some kind of gammarus or krill, or any shrimp with a soft shell really, it contains lots of fiber and other good nutrients, have some gammarus myself, fishies love it!
I also feed them Tubifex on a daily basis, but since the risk for contamination and illness is higher with tubifex, I buy it freeze-dried in cube-form. Next you may want to get some gel foods maybe? If they're available, get some with brine shrimp or fresh blood worms, really good for your babies