Am I just feeding an empty tank?
 

I'm breeding ghost shrimp, and I have a seperate tank for the fry.

They were released 11 days ago, and by 8 days they started to leave the glass, and by nightime I couldn't see any of them, but there is Java Moss and a mini sunken ship so they could be anywhere!
I managed to catch a glimpse of one baby shrimp, but none in the past two days!

Am I feeding an empty tank? 0.o
When will I be able to see them?

Also, I'd like to know how much to feed my main ghosties tank.
There are 27 mature ghosties, one betta and two mystery snails. I know that they'll forage, but it seems they are always looking! And they all rush for the food! I notice some of them don't get colored bellies, so that means they didn't get any food.
I feed a small pinch on each side of the tank once a day and of they all have empty tummies I feed a pinch in the middle of the tank at night.

But I notice more empty bellies!

they are most likely hiding in the moss and inside the ship
best time to catch them out is at night no lights on just a real small flash lite
they could also have jumped out if your tank is not covered
a small piece of nylon screen would work to cover any small openings you have or even the whole top if there's no cover (they are jumpers)