I'm looking at raising some Cornish x Rock chicken and I have a couple questions. 1. These chicks grow alot faster but I'm wondering if they mature faster? Meaning are they able to be removed from a brooder earlier? Or do they stay the same amount of time as a normal breed? 2.36x20x12" how many chicks could stay in here until they are old enough to remove from brooder? I don't want my animals crowded. 3. What are your opinions on a reptile heat pad instead of a light? It is temperature controlled and I will pay lots of attention to Temps.