My 4 RIR’s are about 3 weeks old I’m guessing. My hubby built this brooder for inside the coop. Will it be sufficient to keep my littles safe from the big girls? And when can I put them out there? Temps in the coop are in the 90’s during the day and about 70 at night. Thanks for any advice. This is my first time integrating new chicks into the flock. Pics of chick and brooder below.