About a year ago the pond snails were getting out of hand in my Frontosa tank. It didn't matter how clean and tidy I kept it. Every feeding brought out the army. I purchased 10 assassin snails and put them in. Kinda forgot about them until a couple of days ago. Then I saw one draining a pond snail of it's fluids. I guess it happened so gradually that I just didn't notice, but they're pretty efficient Killers. Good job! Kudos.