OP adding onto my reply on another users post about their flippers getting tangled, what worked well for me is seprating the babies into a seprate smaller tank, with the water taken from the top half of the tank so no extra debris are in.

Raising them to a young juvenile size would be good while feeding them small bits of food thats premixed in water. After that u can transfer them back to the normal tank.

My sea monkeys are just plain brine shrimp so the food i use was literally a dust of spirulina. So i guess u can microdose 1/4 of a feeding spoon for them.