Fwiw, there is a fair bit of evidence that live or frozen foods are better for fry than man made dry foods are. Depending on species, they have varying need for some things such as Omega 3 fats, which typically need to be from animal sources, not plant sources, unless the fish is a vegetarian type. Not many fish are total vegetarians. Omnivores and carnivores really need some animal fats in their diet, from live food if you can get it, frozen if that's just not possible.
Brine shrimp are one source, but only the baby ones are really good food sources, by the time they are 24 to 48 yours old, they have lost much of their value as fry food. You might be able to get frozen Baby brine shrimp, BBS, if you look.
Other live foods often found frozen would be daphnia or bloodworms, though those would have to be crushed too, until the fry grow some. Fruit fly larvae are another good food, but unless you can get flightless flies, they can be quite a nuisance
Micro or banana worms or walter worms are all very good fry foods, and not difficult to culture. Vinegar eels are quite easy to culture too, but may not be quite a nutritious as the other worm types.
Micro and banana worms are quite high in fats, thus quite good food for fry of most types. Micro worms live about four or five days once in the tank, so there isn't so much worry about them dying, and many fry will pick them off the tank bottom and save having to feed so often too. I keep my Endler fry in a bare brood tank and just add more worms when I see there are none left. They are easy to see wiggling on the bare bottom. Banana worms are about half the size of micro worms, walter worms about the same as banana worms. I am not sure why they are called banana worms, unless it's because they live well on mashed banana, but they are actually harmless nematodes, as are microworms as well.
Before modern fish foods were invented, all fish keepers had to culture or catch live food for all of their fish and fry.
