I'm supposed to have 25 LF chicks sent to me soon, and have several questions. I thought to start out keeping them in the house in a cardboard box for the first 2 weeks. Then I would like to move them out to the garage for the next 4 weeks or so. I thought I would construct a plywood brooder for the garage with a wire floor. Question 1--How big of a cardboad box do I need? Question 2-- Would a 4ft x 8ft x 18in. high plywood brooder be big enough for the garage? Question 3-- I'm told that I need to give them very fine chick grit, is that true or is there grit already in their food? Question 4-- Will the commercial chick lamp (I think it is a 250w light) keep them warm enough in the garage, It sometimes gets down in the 20's here at night. I will have a floor and litter for them. Thank you for any input you might give.