The best food for the tiniest little fry in my opinion is walter worms banana worms vinegar eels etc once the fry grow a little larger then you can feed a food like first bites.
Baby fish fry food.
In a small pan add oil to stir fry garlic and leak slowly till yellowish brown.
Most fry begin life eating microscopic organisms such as tiny crustaceans and algae then move on to larger items like insect larvae.
2 months to 4 months.
Unfortunately i learned this the hard way when i made my first attempt at breeding betta.
Once they start growing you can increase the size of the fish fry food accordingly.
Remove and replace daily for the first several days.
Some species can be ready for larger foods in a matter of weeks.
Spread fish out on sheet bake at 100c or 220f for 5 minutes stir around and let dry for 5 minutes then bake again for 5 minutes.
Egg yolk is a power packed food that is easy to make into preparation for newly hatched fry.
Hang it in the tank and the fry will feed off it.
May repeat one more time or until the fish is hard enough to stand the following stir frying.
Stir in salt and fish to finish.
It can take several months before your adorable little goldfish fry start coloring up you ll also be able to notice more defects as the fish get larger.