o btw, in regards to gecko's being in the sand in the wild, it is true but also untrue. You can find sand within their environment in the wild, but does not account for its entire natural habitat. They live amongst rocks and even can be found in human settlements. So to say that they live on sand in the wild, is such a misconception, go out in their natural habitat and I doubt you will see only desert sand, but a mix of sand, dirt, and rocks, also with shrubs and other desert vegetation. And like said above, if you will stick with the sand, definitely feed in a small tank, critter keepers work best.

if you want to stick with the repti carpet try triming the edge just a bit so that it lays flat. It looks like in your pic that there is a bubble from it being to wide... If it is flat the crickets are less likely to be able to get under it.
No Night Light needed.
And part of the issue with the bites may be that it is in a new place and scared and was trying to defend itself. It doesn't know you and just reaching in and grabing it kinda seems like predator going after prey....

Good Luck!

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I wasn't trying to say that... But I know that people that keep their animals on sand will argue the point that if there is sand out in the big bad world and they have survived that they should be able to survive it in captivity. I NEVER said that was my belief. I think that in some cases it can be safe, but it is ALWAYS a situation where you have to weigh the risk vs. the gain....

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thanks everyone!

It sounds like most of your issues have been addressed already. The habitat looks good, but make sure the rocks don't move. Carpet > sand. No light at night, no sitting the cage in the sun, and they don't need UVB. And yes, they will bite. Moorish geckos are definitely a look-don't touch pet. Most small lizards are, leopard geckos just happen to be a rare exception. I have a white-spotted wall gecko myself and they're not much different than moorish geckos (same genus).

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+5 bonus points to whoever finds me a job!

"Eagles may soar, but weasels don't get sucked into jet engines." - John Benfield