My son just hatched chicks in his classroom and we got two. We are first timers and don’t want to mess this up. I got a 75w red reptile heat lamp and have them in a plastic bin with paper towels, food and water. My thermometer on the side of the bin reads 84. The chicks hatched within the last 4 days. Is this too cold? Do I need a bigger lamp and a bigger box as well? They will move to a friend’s coop when big enough as we aren’t allowed to have them in our neighborhood.