Yes, cleaning the bottom of the tank is tiring - and as my fry are still so small, as you say, about the length of a very short (and translucent!) eyelash, I have to be very, very careful not to take any of them up. And as my brood is shrinking, I feel I can't afford to lose an extra one or two.
I do wish I had learned how to hatch bbs earlier on in this process. Do you think if my new batch isn't ready, the fry would take some of the frozen bbs I have to tide them over?