Approximately 4 weeks ago I got 8 chicks from our local feed place. Wife wanted white ones though and a week later when I walked in, they now had white chicks (white plymouth rocks - my first 8 were a mix of GLW/black sex links/red cross). I have been brooding them in a 50 gal tupperwear container. The original 8 are fully feathered, at least to my eyes, but the 2 white rocks just have wing feathers and some back. They are all in the same brooder. The coop is done and ready, but I really cant get eleteric to it. My delima is the original 8 are getting really big and the brooder is getting really crowded. I still have heat lamp on, but its about 3 1/2 feet above brooder. All the chickens have been outside in a pen during the day this week, except today because of rain. Outside temps this week have been 65-80 degrees during the day, with lows at nite around 60 to maybe 55 on the coldest nite. I have read I need to wean them off heat lamp, but worry about white rocks. Should I just turn the lamp off and let rocks snuggle up to older chicks, which they already do? Should I just stick everyone outside in coop at nite? Will I have problems if I keep two chicks inside at nite and then try to put them out with their older sisters in a few weeks? give me ideas!!!!!