I'm getting 25 chicks in 2 weeks, and am trying to figure out what to do for a brooder. How much space will they need, and can they all go in together, or should I separate the layers from the faster growing cornish x? I was thinking of using a childrens pool, but a friend of mine said he didn't think that would keep the heat in well enough. I do have a dog crate that is the giant one(we have a great dane), how many chicks could I put into that?