Three to one. They will be OK outside. Leave them locked in that coop section only for about a week so they get used to it as a safe place to sleep. That doesn't always work, sometimes you have to still train them to go to bed in the coop, but it's worth a try.
I'm not sure how big that coop actually is but it will be plenty big enough for 6 chicks that age. Since you are in Florida they will be able to go outside all day every day which will take a lot of pressure off of coop size. I assume that frame will eventually be their run.
I'm not sure how big that coop actually is but it will be plenty big enough for 6 chicks that age. Since you are in Florida they will be able to go outside all day every day which will take a lot of pressure off of coop size. I assume that frame will eventually be their run.