i have 2 loaches in my 90gal, and they are in there with millions of mts and rams and they just eat mts they like the tiny ones they fight over them that all they eat they come out at night like the snails and eat till full, never noticed till i vac then thousands of shells come out in the vac. so they are doing their job, just get them and put in the tank to grow and live there i have many but they do their own picking them out..