I just bought 6 guineas this past weekend. They're around 12 weeks old. We hope to hatch a few more, in a different color, when eggs are obtainable. They're currently quarantined in the garage that has the coop on the other side of the wall, so they can hear the chickens. It got down to the low 20's yesterday morning, so we have the heat lamp on for them. It's in the 50's and 60's during the day. Should we still leave the lamp on for them?