Sounds like you are taking good care of the injured one! I have a couple of suggestions, though. You should move them to a bigger bin, because at this age the temperature should be about 80 degrees F, or 26 degrees C. In a bigger bin, you will be able to tell if they are too hot or cold. In a smaller bin, if they are overheated you wouldn't be able to tell, because they have nowhere to escape the heat. Also, a bigger bin will prevent fighting and boredom. You can move them to a dog crate if you don't have a larger bin. In the meantime, the lamp could probably get moved up while they are still in the small bin. At hatching, the temp should be 90 or 95 degrees F. (32-35 C) each week, the temperature should be decreased by 5 degrees F.
They are all so cute! Do you have names picked out? Like TheKindaFarmGirl said, posting pictures when they are a little older will allow members to tell you the breeds/genders.