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
Has a descent growth rate and brazilian black
slow growth rate)
Also, what size crickets would a 3/4" or 1" need
I feed small size crickets from pet smart and just crush the head of the cricket and tong feed or drop it in there. NEVER had a problem by doing it this way. from ? 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
Pinheads would work if you can find them too. They are just a pain to catch to put in there and get out if they are uneaten. also not much meat to them.. I'm trying to figure out how long I would need to buy super small crickets for a tarantula
Don't really know the answer to that. 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)
Good reason to buy more T's 
.. But I guess as the crickets grow I could feed them to the geckos
Yup 
!
I DO have a working mealworm colony of various sizes, but can mealworms be fed to tarantulas
They can be fed to tarantulas. I generally use super worms. Meal worms from what I understand have a higher chitlin ratio also? I do not really like using supers or mealies as a staple because I can gut load crickets and dubias waaaaaaay better then a super or mealie (although I am trying to change that). Plus mealies and supers from what I understand have and are pretty fatty and this reason is my MAIN concern for not wanting to use them as a staple. Someone once wrote it as like humans eating Mcdonalds every day. Don't know how true that analogy is but it kind of makes you think. And I am always paranoid about grain mites too. I had big colonies of mealies and supers when I had a lot of leo's and never got grain mites (don't even keep a farction of that size now) but the possability is just always lingering in the back of my head. With that said though I do supplement with the supers but try not to use that as a staple unless a T will not eat anything else (so far my parahybana is not wanting anything but supers and is being quite difficult about it).Would they be good for them?
My answer would be yes and no. I don't see any problems with my parahybana from just eating super worms but I have not had her even a year yet so taht is not enough data for me to say for sure from experience. I would like to give her a more varied diet if possible but just because I would like to does not mean it would happen and just because I think it would be better does not mean that is correct either if you know what I mean.
Just still figuring out the feeding part. Once the spider is bigger it wouldn't be an issue, just when it is young!