All have eaten frozen bbs and frozen rotifers? Are you sure you are seeing them eating frozen? If they are eating frozen, start feeding them something more substantial like frozen cyclopeeze. What are you enriching the bbs with? I would be enriching with Selco or else you are going to have die-off problems in a few days from lack of nutrition.
You are having a really odd experience with your fry. You have erectus from Jorge, which should make them northern erectus and should make the fry pelagic, but your pics from the first day have the fry already hitching. You also have them eating frozen after the first day, which is not normal. I would also be suprised if northern erectus were able to eat frozen bbs as newborns because of their size and the size of frozen bbs... I am inclined to believe that you actually have southern erectus, which are larger at birth, can be fed larger foods, and are able to hitch at birth; and also to believe that your fry may be "interested" in the frozen but not eating it. So definately keep a close eye on that.
Are you siphoning out the waste and leftover food after feedings? That is one good way to tell if they are eating and what they are eating. Also, they should all have little orange bellies after eating. Keep an eye on those water params if you are putting frozen foods in there.