I don't do anything special for my mystery snails which are in a community tank. They consume all the algae from the tank walls and decor and also seem to be absorbing micronutrients from the plant foliage. I use a variety of foods in this tank and the snails are vibrant and healthy. I'm sure they are simply scavenging from the bottom of the tank. They are competing with two shrimp species as well as kuhli loaches, but they do fine.