south american loaches

ok its not cory related but i had major snail problems in one tank which i couldnt understand since i ahd 4 khuli loaches who are supposedly fairly good at getting rid of snails, i was feeding sinking pellets every second day and then someone said i shouldnt feed them at all or cut it down to once a week and voila suddenly empty snail shells started appearing all over the tank. snail problem solved. even if the corries arent big enough to eat the adults the babies should be easy prey, especially just after hatching.