I got 5 baby chicks in the mail yesterday (first time chicken raiser) and have been trouble getting the temp of the brooder right. The chicks keep huddling up in a ball, but on the outside edge of the brooder not close to the heat lamp. Originally when I brought them home I had the heat lamp lower to the ground but over time they started to slow down and get lethargic. I moved it up higher and they started moving around again but then plopped back down into a ball together. I have a pic here, can anyone tell if they think they're too hot or too cold?