This is a discussion on how do you know within the Invertebrates forums, part of the Freshwater and Tropical Fish category; -->
here are some pics of my snail (mizz. ivory) eating i dont think that i am going to have a problem with this one ...
You can feed her every day, when you feed your betta. Part of the problem may have been the large marbles you're using on the bottom. My snails eat any excess food that reaches them, but the marbles in your tank allow all the food to fall between the holes.
If you switched to a smaller substrate it would work well for you too, as your snail could clean up after the betta.