Kanchii, keep an eye on the one with the scissor beak to be sure it is able to eat and drink properly. Make sure that this little challenged chick's food is in a deep enough container so that it can scoop some up.
Last spring when I bought chicks at the local feed store, the lady there said she would just give me a chick for free when I was buying the other chicks. I wasn't paying much attention and thought she was just being nice. When I got the chicks home, I realized that the poor little thing had some problems. The little chick turned out to be blind in one eye and have a terribly crossed beak. This little chick had a great bit of difficulty pecking food unless it was presented in a deep enough container so that she could scoop it up. We named this chick, Helen, (after the infamous Helen Keller) and Helen is now a reasonably sized pullet that gets along very well despite her handicaps. However, Helen did grow more slowly than other chicks her own age and breed. I still have to be sure to present food in containers with some depth, especially the treats, so that she stands a chance of getting some, too. With the crossed beak and the bad eye Helen has always had a hard time pecking things off the ground or flat surfaces like pans or paper plates. I'm sure that her aim is off because of the blindness in the one eye. The crossed beak interferes with her grip on bits of food.
I know that you're just baby-sitting these chicks for a short while, but please make sure that your little challenged chick is able to adequately pick up the food from the food containers you are using.