If the population is kept to a manageable size, ramshorn snails can be good tank cleaners. They eat algae and dead or dying plants generally, so they can be useful. However, if they breed too prolifically they can become a nuisance. In warm climates (such as those in mainland Australia or the southern United States) they much prefer ponds, especially outdoor ponds. Algae, dead leaves that sink to the bottom, mulm and dead animals can be a problem, as they foul the water. Ramshorn snails eat all of these things.