Good choice going with LLL, you will get a true P. Adspersus. Start with a 10 gallon. You want long vrs. tall when choosing your tank. A typical water bowl that goes chin high will work. Pyxies do not need to be submerged. I use infared/black bulbs for lighting, UVB is not necessary. I also use a zoomed humidifiers on occasion, but this is also not necessary if you have the time to just mist to appropriate humidity levels.