I do have a few more questions for you (or anyone else I guess who would see this?)

How fast do these guys grow? I guess specifically these two (green bottle blue and brazilian black)

Also, what size crickets would a 3/4" or 1" need? I ask because that's about the size tarantula I keep seeing, and I was wondering if they need pinhead crickets or 'smalls' or whatever size. I'm trying to figure out how long I would need to buy super small crickets for a tarantula. I don't breed my own crickets, and the stores around me sell by the dozen, so I'd end up with a bunch of tiny crickets that none of my other animals could really eat(and would get too big too fast probably if I just kept them).. But I guess as the crickets grow I could feed them to the geckos!

I DO have a working mealworm colony of various sizes, but can mealworms be fed to tarantulas? Would they be good for them?

Just still figuring out the feeding part. Once the spider is bigger it wouldn't be an issue, just when it is young!