I can't remember how big ghost shrimp get, but I wouldn't give them to a 1inch RES. If they're like Krill, then you should probably wait until he/she is atleast 2- 2 1/2 inches big. I started giving mine live food when she was 5inches(Krill and tried a few guppies). That's probably late, but I didn't have her until she was about 5". If your baby isn't catching/eating them or their making him/her uncomfortable, I say take them out or put them in a seperate tank/enclosure.
Hope this helped
