Adult spixi's won't eat live plants, but the baby/young ones will until they outgrow the bad habit. They're not aggressive toward other snails, but will eat the eggs of their own and/or other species. They're actually fairly effective for limiting population growth of ramshorns IME. (Either that, or the pleco's starved 'em out.) In a 30 long with ramshorns, spixi's, BN's and L333's it looks like the ramshorns aren't any more numerous than the spixi's. At one time I pulled hundreds of ramshorns out every couple months. Now there are only a few to be seen, and no babies.