I don't mean to sound mean but you really need to take some of the advice of the members here. that exo terra there could house - at least - 10 juvs of the size you have.
I understand asking a lot of questions if you're unsure (and for the most part people here will be kind to reply) but you should really have done a lot more reading into keeping a T before picking it up. Many of the questions you're asking are literally the first things you'd find out reading 5 minutes of any care sheet.
Head over to arachnoboards or look up some of the care sheets here. Or just do a quick google search for brachypelma care guide.
Learn a bit and share the joy of watching your T grow with the community : )