I have a few options

[nikkirae123]

I have a 40 gal tank with top (made for lizard) I also have something like that. What would work better for the first 2 weeks. They will be inside my house in a very warm room. After they are a bit older I will be putting them into a dog pen.

 

[red horse ranch]

I assume you are talking about newborn chicks. I use a wire cage like you have shown. But even tho it is in our warm house they still need a source of heat such as a brooder lamp with a regular 40 or 60 watt bulb. This should give chicks the 95 degrees they need the first week. I also have a sheet covering the top and 3 sides. The 40 gallon tank would also work as long as they have ventilation.

By the way