The ants will harm the eggs and the lizard.

I found a trick to take care of this that I started in another thread.

http://forums.kingsnake.com/view.php?id=1307227,1310368

Instead of using the freesbie, if you have one of those CD/DVD container that you bought, just leave one in each leg of the shelf and pour water and a little bit of dishwasher soap into them.
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I will be back!