Antibiotics really ar it neccesary. It is correct, if your chicks are sleeping farther from the light you should raise the light higher above. Looking not at the pictures of your brooder, I would recommend covering the newspaper with a different bedding. It is recommended to only use newspaper for the first two or three days because you want thme to find their food without thinking their bedding is the food, but newspaper can cause leg problems. you are doing great, your chicks look healthy and they should become more active soon. If I were you, I would put a VERY low perch in their cage so that they can start flying if they are up. Congratulation!