I have chicks from 12 days old to maybe 3 weeks old right now in the brooder. They seem bored. I’m looking to possibly make a small temporary dust bath I can take out once they’re done using it. When water spills, they try to make a dust bath out of the wet newspaper. I’ve read several forums on what to use. I’ve read concrete sand, dirt, sod, wood ash etc. I didn’t want to use yard dirt yet because of the 12 day olds. Any feedback on this would be helpful. Thank you in advance.