I have 27 chicks in total and 4 of them are undersized and not doing well. There are 2 of them that shake when they eat. They are three weeks old and kept indoors in a kiddie pool with about 4 inches of shavings (pine) untreated. The temp. is a around 82 and I use a heat lamp with a red bulb. I am feeding them Chick starter by Nature Wise. I bought them from Murray Mcmurray and they have been fine up until last week. I have all brown egg layers with different breeds. So I am not sure of the breed. This is the first time having chickens, so just want to make sure I am doing everything I can to help the runts make it. I have seperated the 4 that are not doing well and making them drink water with terramycin (double dose). Any help!!!!!!!!!!