The second girl is quite young, a few months if she's lucky. Here's a better picture of her:
Sadly I have no new photos of the one in question, she's fast and clear and won't stay still for pictures in the sorority. Our store doesn't have any dT but they have VT, DoT and CT. Interesting!
The first girl was in a tank with about 40 other females, all the others look the same except this girl. So maybe someone jumped the fence before shipment?
The second one (cambo) looks like all the other girls in the tank. I'll have to keep and eye on her and update this thread when she's much older and done growing.