To big for a brooder to small for the coop. Help!

[backwoodsmamma]

I have 21 Chicks that are between 3-4 weeks old. I have been keeping them in a 75 gallon stock tank with light for there brooder. 10 of the chicks are Sex Links and have grown really really fast. The others are Wyondottes they are getting bigger but not as big as the sex links. Then we have some barred cochins that are even smaller than the Wyondottes and last of the 21 are some little silkies. They were all bought at the same time but now they are all different sizes. To boot we are getting two new silkies today. Also the sex links especially are trying to fly and really eyeballing the edge of the tank wanting to get out. I know it is just a matter of time and we have dogs in the house that would love to have them for lunch if they they did. It is to cold outside I think to put them in the coop as they only have feathers on their wings and getting pin feathers on there chests. It drops below 30 degrees at night easily and day time temps right now are between 40-60 degrees.

Here are my Q.'s

1. Should I just seperate out the larger sex links from the others to make more room or make more room for everyone.

2. If I so seperate them up will they fight later when put back together?

3. Most importantly What have you used in this situation? To big for brooder to small for coop.

 

[FatherofFlowers]

Watching this thread for responses, as I might run into the same problem due to my chicks being slightly different ages and a bunch of different breeds.

 

[gimmie birdies]

I have my 4 week old chicks in the coop it gets quite cold here but I had mine in a cabinet when they were younger, 90 degrees at one week, and recently moved them to a large box I don't know what the temp is but I have a couple of lights (secured) and check on them. one light during the day 2 at night. I tried to move them to a pen that had access to outdoors, and the lights/heated pen, and they didn't like out doors so maybe in another 2 weeks.