UPDATE: Everyone is OK now. I am guessing a few factors helped.
1 - They are above the 5 week mark now. They started to lay down more often.. less "energic" if I would say.
2 - I started to feed more (in quantity I mean) after comparing my weights versus cornish X weight charts. Now they eat double the amount they had before.
3 - I let them lose more hours lately AND it's been really super hot. I am sure the temperature makes them calm. There are temperature warning in effect, so I suppose the chicks also suffer from the heat wave!
So the heat is a pro and a con

I know they are sensible to heat and I got one with a heat stroke this weekend.. but on the other hand they stopped fighting! I went to water the run a few times during the day time, to try to keep the heat out as much as possible. At least they have a lot of shade!
I also lost a few crops because I let them lose lol. They love the brassica family. They eat all my rapini (I hate it, it's OK). Also I grow broccoli-kale. They didn't touch it until it formed a broccoli head. I saw the heads on friday, all exited for my first broccoli to grow to that point!
On saturday AM I noticed the chicks had eaten all the broccoli heads LOL. At least they are getting fresh greens..
Next year I am growing a brassica field for them
