I have some Rotala wallichii as well. Its fine leaves are also eaten by SAEs if you aren't careful. That is one of the few plants that are harmed by SAEs. You could get some Malaysian trumpet snails (aka MTS). Those haven't harmed my plants at all.
Gene Heitman - 12 tanks (11 freshwater and 1 saltwater), 206 gallons, 20+ species of fish/shrimp/snails, 52+ species of plants ... 10 years ago I just wanted 1 tank with some fish