I was feeding Dora the leopard gecko crickets. When powdered they turned a nice pale colour and you could tell there was alot of supplement there. I have since switched to meal worms, and dusting them seems like a waste of product. So someone suggested leaving some supplement in a bowl in the tank at all times. My question is....how do I know if she is getting it? And when do I replace it? Do I put new supplement in daily? Or every few days? And it seems like none of it is dissapearing this way (I still dust the worms even though it seems redundant) so is there any way to tell she is actually getting some? Thanks.