I got a little gecko (4 or 4.5 inches) from PetCo (I know, it's PetCo)and have him/her quarentined in a 10gal tank to get it used to me and my house and what not. I already have a larger gecko (about 8 inches) in a 20gal tank and plan on adding sand. My question is, would it be alright to put them together, or should the new one grow more? How big does the little one need to be before it is housed on a sand substrate? Thanks


