A single leo can live out it's entire life in a 10 gallon aquarium but 10 gallon tank is the minimum for one adult leo. The tank should have an all screen lid to provide the best ventilation. The best kind of heater to use for leos would be a reptile UTH (under tank heater). You can stick the UTH directly to the bottom of the tank but make sure it only covers a quarter to one half of the tank...no more!!! Attach the UTH to a rheostat or thermostat to prevent it from over heating. I also use a heat lamp to boost the air temps since UTHs only heat the floor of the terrarium, but a heat lamp is optional. The warm side should be in the mid to high 80's and the cool side should be room temp.
For substrate, start off SAFE. For my adult leos, I use sheets of paper towels because they are cheap, practical, and most of all, absolutely safe. You can use sand if you like, but it can cause impactions and eye infections because of the small particles. BABIES SHOULD NEVER BE KEPT ON SAND. I use a mix of paper towels and decorative tiles for substrates in my tanks...the decorative tiles (floor tiling) look nice, transfer heat well, and are safe.
Leos are nocturnal and they will hide throughout most of the day. A leo should have access to a humid hide (I use cool whip containers (with a door cut in the side) filled with wet paper towels). Put the humid hide over the UTH so it can generate enough humidity for proper shedding. The leo should also have access to a dry hide, which can be a commercially available hide (ex: a plastic log from the petstore) and this should be placed on the cool side. A water dish is essential and fresh water should be available 24/7. A small, shallow dish with Miner-all vitamin/mineral powder (or the like) should also be available to the gecko 24/7.
For food, leos can be fed a staple of mealworms or crickets. I use mealworms as my leos' staple because they are easier to care for than crickets. Which ever you chose, the crickets or mealies need to be gutloaded. I use a gutload made out of dry baby rice cereal, dry baby barely cereal, powdered milk, miner-all vitamin/mineral supplement, and dry oatmeal. I provide a piece of romaine lettuce or carrot once a day for moisture. For adult leos, you should dust the feeder insects once a week with Miner-all and babies should have their insects dusted every other feeding.
Hope that helps some!!!
Cleo
1:1 leos (6 eggs cooking) 