Best natural solution for MTS are assassin snails. Some of the larder dorads (Megalodoras) will eat them but these get way too big for the average home aquaria. Assassin snails are readily available, there may even be someone local who has some they would sell (as shop prices can be too high to be able to buy a group of 5-6).
Check out the classifieds and see if anyone is advertising them and will post.
HTH
Martin