I have 18 2 week old Barred Holland chicks that have just moved out to the coop, since they outgrew the brooder. Still have heat for them and no drafts and they're our only chickens. We have been using pine shavings for the floor of the brooder and coop but lucked into some very inexpensive cypress mulch. Is there any reason we shouldn't use the cypress mulch on the floor of the coop? Thanks for your help!