Correct humidity for slings?

[Crystal C]

Hi! I have a Honduran curly hair and a Chilean rose at home. They're both beautiful sweet girls (I'm calling them girls until I can send their molts to someone to sex them for me). Their tanks are both hovering at the perfect humidity and they seem very comfortable.
I have 2 slings coming from Tarantula Canada at the end of the week (a 3/4 inch Mexican red Knee and 2 inch Chaco Golden Knee) and for the life of me I can't find any information about what humidity to keep slings at! Is it the same as for the adults of the same species or a little higher?

 

[Poec54]

I give slings a little more humidity than adults of the same species, which means slightly moister substrate. There is a limit, so don't overdo.