Worried my brooder is too small (revised post)

[linguafranka]

I cannot figure out how to edit my previous post, so I had to start over.
Worried brooder is too small & they can hurt themselves as they jump & try to fly.
Chicks are 2 and 3 weeks old. They are getting really active & hit the walls a lot!
One injured her neck yesterday but no one saw it happen, we wondered if they are too crowded.
thanks!

the brooder is made of 2 plastic tubs.
H = 30"
W = 30"
D = 20"

 

[Mahonri]

Yeah, you'll soon need something bigger.

But at 5 weeks they won't need the lamp if you are in a warmer area and can go outside.

 

[junglebird]

You could cut and tape together a larger brooder out of scavenged cardboard boxes quite quickly.