Hello! Your little ladies are adorable. I have a few concerns about your set up though.
Leopard geckos can never be housed together no matter the sex or how long they have been together. Eventually, you'll come in one day to a blood bath.
Any loose substrate should never be used in a leopard geckoes enclosure. No matter how long you've had it, it is a daily death threat. Switch it out for some non adhesive under counter lining. It is easy to clean, super cheep, comes in a variety of natural colors, and runs no risk of impaction. I get it at Walmart.