We are currently using a 40 gal Oval Feeder Stock tank that is roughly 38 x 29 x 13. Will this be big enough till we move them outside at 5 weeks or so? 2 of the chicks are 3 weeks old today and 1 is only a week. PLEASE HELP. This is all so new to me and don't want them to be crowded. Any Advise will be helpful. Also, we live in the seattle area and the temps at night are in the 40's right now. Would they be okay to take outside soon to be put in the coop? And would you use a heat lamp?