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I got a regular female leopard gecko approx 1 year old and a male albino boy approx 4-6 mo 2/23/08 at a reptile show. They seemed to be eating fine at first, but about 2 weeks now it turned frustrating.

The male seems to eat but only when left in the dark. Out of 5 meal worms I leave for him overnight there are 4 or all 5 in the morning. Crickets he'll eat almost all if left alone.
The female doesn't seem to pay any attention to worms or crickets. I will find the mealworms all over the place in her tub.

Since they're still in quarantine I haven't but them in with my current female leo. I have them in seperate tubs of 16 in long, 12 wide, and 6 deep. Their water is changed daily, they have their own little hides, humidity seems okay, and they're on newspaper.

female's weight on 3/3/08 was 57 grams, today she weighs 54 grams
male's weight on 3/3/08 was 18 grams, today he weighs 26 grams.

Any suggestions are welcome.

What temps are you running? I'd start with those, maybe they are too cool or too hot. Both can be equally detrimental.

As for the gecko that only eats in the dark, maybe it just feels safer. Mine don't always eat in front of me, they usually eat without my supervision. And the one that eats mostly crickets, maybe that is it's preference. They are all unique, pay attention to what they want. Sounds like you're doing well, have fun, good luck.
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0.2 Leopard Geckos (Fire and Mello)
0.0.1 Blue Tongue Skink (Smoot)

Yup, start with the temps, much more important than humidity. Aim for close to 90F in the day and 80s at night if you are feeding mealworms for sure because of the digestion requirements.

Two other suggestions: changing the water and the feeding might be a lot of stress for them. Try to interact with them as little as possible and keep them in a quiet area of the house. For instance, when we can we just keep the hall light on and feed our geckos from that little bit of light.

Another thought is to contact the breeder you got them from and ask what kind of food and supplements they were using. Sometimes a gecko doesn't immediately transfer to a new supplement... I mean, if you think about it, your food usually smells like mineral powder A and now it smells like B. You'd be a little confused too. At least the little one is putting on weight if I'm reading it right, that's a good sign. Good luck.
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0.1 Albino Leo Gecko
0.1 Crested Gecko
1.0 Dear Boyfriend
Departed: Harvey and Spock