Let me try this all at once....
>>However, some of my older geckos (2.5 yrs old) eat a lot less now, around 10-15 mealworms per week, is that too little? How much does an adult gecko eats on average (in terms of full grown mealworms)?
It does sound a little low... OK if they are maintaining weight though. Try offering some crix and other food sources and see if you can't keep the apetite up... and remember: It could be worse! I'd rather see mine eat anything during a week instead of none =)
>>Do leo. geckos, or can leo. geckos rather eat to much? If I kept a dish with mealworms in it and the leo geckos keeping eating them all, should I keep replacing them? They still eat 8-10 crickets every other day also.
I would say if they have no problems, stick with it. Leave the dish in there. I HAVE seen a few leos eat too much and regurg it all up. It stresses the hell out of them ,and they refuse food for a few days after.
The babies sound like they are eating enough. I'm a proud believer in the "feed as much as they will take (without regurg)" theory. And the setup sounds perfect (if you add the word thermostat in there somewhere... lol).
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Brian Skibinski
Milwaukee Reptiles
Brian@MilwaukeeReptiles.com