The last clutch had a mom, so I haven't dealt with this in years. We have 2 rouens and 3 runners, all about 3 weeks old. They're getting big and more and more messy, and I'm ready, but are they? They still have fuzz, but don't stay under the heat lamp anymore (for the last 2 days). It gets into the lower 50's at night. Should they have heat at night if they go to their outdoor space? Thanks for any responses in advance!