I think a little nerite would be a good companion in your tank.
I have 5 - spread out over 3 tanks - and only one of them will actually feed on algae wafers. But everyone seems to find enough to eat. I leave the lights on longer to encourage algae growth, and"grow" the algae rocks JadeSparrow mentioned.
They also feed on the biofilm as well as algae. So if you are wiping down the tank walls at all, stop doing that in advance. Another thing to remember is that the more objects in your tank to grow biofilm on ~ like decorations, wood, fake wood, etc., the more will be available for them to eat. Just don't scrub any of those when you do water changes. Don't worry about algae on them - these guys will take care of algae for you!
Good luck ~ snails are such fun! And nerites come in such an amazing variety of colors and patterns....