My husband and I bought 2 Bard Rock chicks last week and they are now 3 weeks old. They seemed to be doing fine in the box under the heat lamp, but one is growing and progressing and the other is the same size as when we got her. Yesterday she stopped standing and seems really fatigued. I went today and got a separate box to put her in. I also got medicated chick feed and vitamin/electrolyte supplement. Any other suggestions on how to make her better?