I had pond snails, still have one ramshorn left from about 10, and a about 50+ malaysian trumpet snails.
the pond snails and ramshorn snails only really ate the brown leaves of my plants that I didn't remove in time and never bothered anything green. I have two swords and one anubias. they also did a pretty good job of keeping the algae in check
Soon there after my betta acquired the taste for escargot. All the pond snails are gone and I have one ramshorn left. just when I think my betta ate them all one or two ramshorn snails pop back up which doesn't bother me. Then the cycle continues.
now for the MTS my betta want's nothing to do with them. I am looking at possible getting an assassin snail to lower the population since I do not want to get rid of them completely but at least control the population. they like to keep the sand and roots area clean around my plants. but they are so crowded that about 10 are always on the sides of the tank eating the algae off.