there fairly new, there babies and about roughly 6inch including tail, they look healthy and i looked up them theroly today on the internet and researched the disease called crypto. mine do not show any signs of the disease, but i was wondering if maybe in a later time could they catch it?, they eat a lot. and there health is great.
I don't know where you live but I'm a leopard gecko breeder in Canada and I've never even heard of Crypto . Now that doesn't mean its not a bad thing, I just don't believe you have anything to worry about. Just keep an eye on there eating and pooping habits and make sure they aren't getting skinner. The most common things you have to worry about are parasites and Impaction, but if your gecko isn't on a loose substrate and is eating enough crickets that are no larger than the length between your leo's eyes impaction isn't anything to worry about, also parasites have pretty distinctive signs that you pet is sick and you need take him/her to the vet. Also if you get a new leo or anything animal that will come in contact with the leo to quarantine it for 60-90 days to make sure it will not get your leos sick.
pets question and answers,www.5d2d.com
Hope this helps, sounds like you've got a pretty good set up for them in a 40 gal, and re very cautious. Good luck and congrats on the little guys.
With any animal (birds, fish, reptiles, etc ) its not recommended you place them together for at least a couple months for a quarantine. Reptiles are very good at hiding health problems often until its too late. Personally I would not place any of the together until you take them to a vet to be checked for diseases, parasites, etc. Crypto is almost always fatal (its incurable) and most vets actually suggest you euthanize the gecko instead of letting it suffer and trying to treat it.