The problem with 10 gallon tanks, and most plastic tubs in racks is that it's difficult to provide an adequate thermal gradient.  I would recommend a larger tank like a 20 gallon long (a 40 gallon breeder would be the ultimate), separate the geckos and tweek your temperatures so that you have a daytime variant of 75 on the cool side (with a hide that provides a high ambient humidity) and a warmer area that reaches the mid to upper 80's on the warm end - but just a small, localized area.  Night temps can drop to 65-75 which provides a more natural day/night fluctuation for this particular species.  I have kept a handful of leopard geckos that lives for 20-25 years and bred many times.  I use thermostatically controlled pearlco heating elements (Spyder Robotics for day/night fluctuations) and a full spectrum fluorescent, small top opening food storage containers with spaghnum moss for high humidity shelters and egg chambers, driftwood for climbing and secure rock piles for hiding....natural sand as a substrate.  You can have a lot of fun setting your gecko up in a natural set up and your gecko will be much happier.

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