Snails And Their Usages, are snails ok in tank Options

[cod piece]

Hi all, new to this forum and have a simple question to start off with, I have a small tank with cory dories in and there has been a flood off snails from some of the plants that i introduced to the tank. My other tank has fancy goldfish in and would like to know what could be the problem if I were to place some snails into the goldfish tank. The reason is simply that my cory tank is spotless of algae and the glass is clean and all for the price of excepting that they breed like rabbits and you have to remove some to keep the balance! Any help on this matter would be appreciated!