I'll give you the same advice as I did in another, very similar thread:


To easily monitor how much they are eating, try adding a glass bowl. The crickets can not get out of it, so you can see if they have eaten or not. A full thread on the topic can be found here:
http://www.frogforum.net/vivarium-te...owl-trick.html You can also modify a good looking bowl to make it unclimable. I'm quoting my own post in the Valuabe advice-thread.

1. Get yourself a good looking feeding dish (e.g. from Exo-Terra)
2. Get yourself a plastic box
(I used http://www.mathem.se/images/products...l-gb-glace.jpg )
3. Get a glue gun and a knife

Just cut out enough plastic to cover the insides of the bowl with it. It needs to be approximately as high as the glass bowl needs to be (it works in the same way, the crickets can't climb the plastic either). Then just glue the plastic to the inside of the bowl (and be sure it's completly dried and ventilated before putting it back, if you have frogs in the terrarium while doing this), and tadaa! A nice looking, escape-proof feedish dish!