I wound up picking up some pest snails somehow, and was torn on how to treat them. For me, chemical treatment was NOT an option. Didn't want to add the the bioload of my tank with several clown loaches, so decided on 3 assassin snails for my 55 gallon tank.
I've had them about 9 months. I JUST counted today and I have 11. I still have some pest snails, but not many. It's totally fine with me because it keeps the Assassins happy. The slow rate of reproduction is fine too, because my LFS will take my extras on trade. Granted, it's not a lot of money, but hey... it goes toward my next fish purchase.
Mine eat anything they want. Never bother fish or shrimp (unless they have died) and sometimes even eat Pleco poop. Gross, but helpful!!