I have a Mack Snow juvenile leopard gecko. I don't know how old he is or what his gender is. I got him about a month ago or so but I'm not quite sure. The pet store person that I got him from told me he is still maturing so u cant tell the age or gender-hence why I dont know. Is this true? if not how can you tell how old he is or the sex of it? Also, I use the zoomed daylight blue bulb for the day time heat and the zoomed moonlight bulb for night. Is this the correct lighting? One last thing, Ive been using paper towels for its substrate. I do have eco earth coconut fiber substrate that I was planning to use for my panther chameleon but im planning to return if the coconut fiber substrate can be used. I heard sand and all those substrates cause impaction in the stomach and I use paper towels because its cheaper, softer, and so my gecko can see the crickets and stuff I feed it.