New to vipers. A couple quick questions.

So I'm relatively new to viper geckos. I just had a couple of questions.

I just got a beautiful new female viper gecko from ProGeckos. I've had a male for about a month. The female is of breeding size (7.2 grams), but the male is only at 3.9 grams. Would it be safe to put them together after she de-stresses a bit from the travel? Or should I wait until he gets a bit bigger?

My other two questions are about incubation.
A) What temperatures should the eggs be incubated at?
B) What do you use for substrate?

Any information would be greatly appreciated!

Hello,
I have a breeding trio of vipers [one male, two females] I would say that how big they are would help you decide if you should put them togather or not. Not so much thier weight but compare how big they are nxt to each other (my one female is really fat and my male is skinny but they are the same lenght)
As for the eggs, they should be incubated between 82-86 degrees ferinheit, My eggs have been incubating at 84 for 50 days now.
With my adults i am currently using calci-sand and for my babies i will be using papertowel as substrate.
Hope i could help

Here is a quick quot from a care sheet I just found, interestingly enough I'm looking into these stunning little guys too!

"Breeding Viper Geckos

Viper geckos sexually mature at 10-12 months. Males mature faster than females do, and can be ready to breed at 7 months. The female will lay a pair of eggs, pea sized, in the moist hide you provided. They continue to lay a pair of eggs every 2-4 weeks for 8 months.

Once the eggs are located you should place them in an incubator at 83-86F with 50-60% humidity for 40-55 days.

Baby viper geckos should be kept in shoe box totes, on paper towel, in small groups. Include a small water dish and several hiding spots so they will feel secure. You should moisten one end of the enclosure lightly to provide some humidity. They will eat pin head crickets or fruit flies.

Babies are very fragile at this stage and should be kept in optimal conditions."

http://www.herpcenter.com/viper-gecko-caresheet.html

To add to the above posts, I currently have a 3.4 group of Viper Geckos, and they are breeding as we speak. I have had 3 hatchlings come out incubating at 84F and using dry vermiculite as the substrate, haven't had any issues. The hatchlings are happy as can be eating mini-mealies and crickets. I keep all the Viper's on sand. Haven't seen any issues with it for them. All the adults are kept together in a 20-L with lots and lots of little hides (Betta Fish Decor) and 2 small Repti-Caves with Eco-Earth for the moist lay boxes. I've been pulling eggs out every other week or so. I can't wait to see more hatch