Both have the orange, the orange is not a good way to tell.
It is way too small atm, if I had to guess, I would go with male. It's mouth looks pretty big for its body. Once again, it is too small. Give it a month, and show it to me again. I will be able to tell then.
Eco earth is good. Use eco earth, and give it a pool. Feed it crickets mainly, roaches if you got them. Give him the occasional pinkie/fuzzy/hopper/mouse/rat pup. You can also give him goldfish occasionally, USE SPARINGLY.
Use eco earth, and some moss for hiding in. You can add a hide spot as well if you want. They are pretty active at night, so give it room to hop.