As identified by you guys on the forum, I appear to have mts that hitched a ride on some plants.Got rid of all but one which showed itself the other day.Does anyone know if these snails can reproduce on their own or do you need two?At moment have got him/her in a jar out of the tank.I do'nt want to put it back if i'm going to have to keep culling offspring, the tank not able to support loads of snails.