(I posted this the other day in an old thread about snails in the invert thread, but thought this might be a better place for it. I apologize if you read this twice.) In my 125 gallon, heavily planted tank I had unwanted snails sneak into my tank. My means of control had been squishing any snails I could find each night just to keep the numbers in check. I probably squished maybe 10 or 12 a night, but they kept right on coming. The situation wasn't getting better an I was concerned that it was slowly worsening. Last weekend I picked up three bristlenose plecos from Todd and introduced them to the tank. Right away the next day it seemed like I had fewer snails to squish, but I thought I was just imagining it. Within two or three days I was down to squishing between 0 and 3 snails per day and have stayed at that level ever since. I have never seen any accounts of Ancistrus controlling snails. I don't think they're killing adult snails, but I do suspect that they're eating snail eggs and keeping the population from exploding. I don't know much about plecos. Is this even possible?