If you want to feed bbs to baby fish then they should be about1-4 hours old or really close to that. After that they loose most of theyre egg sac, and with it ,ost of they're nutrition.
Buying sea monkeys is a waste of money IMO
. I can go and buy a little vial of brine shrimp eggs for 5 dollars, instead of making 20 of them and keep sending in for more you have a whole vial which has thousands of them in it.
When I was littler I used to buy them, now that I know they are brine shrimp I feel wierd paying 10 dollars for them.