[mollyyymo]

In my experience they won't touch the eggs until they're quite a bit bigger since the eggs don't move. But of you're worried about water contamination I would siphon the bottom of the fry tank 20 minutes after feeding, and maybe move the light up a little higher so the BBS swim to the low-middle of your hatchery.

 

[mollyyymo]

I use a turkey baster and I still suck up fry every now and then. It just happens, I'm not sure what more you can do beyond what you're already doing.