Yeap, they're too small to even eat baby brine shrimp or microworms at this stage. Thing is Caryl, there is a light on their tank I've noticed some of them are a lot more reflective than others, probably they're the older ones. Here're some more pics that are a bit better (You can see how tiny they are compared to the Daphnia in the right pic):
These are the tanks they're in, a divided 2ft (Adults tank is on the left there)
I've got the heaters set to 20c, the tanks sometimes get up to 24 in the day though :-?