I have 30 chicks in the brooder now, 10 bantam cochins, 10 bantam brahmas and 10 bantam New Hampshires. I plan to keep about 15 of these in an 8' x 8' coop I am in the process of building. I will have the roost bars at about 40" above the litter. Is this to high for these birds? I read somewhere that birds can damage themselves if the roost is to high. I would appreciate any input as it will be easier to make the change now rather than later. Thanks!