There are some snails that are actually quite beneficial to freshwater aquariums.
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When it comes to freshwater snails, not all of them are bad for your aquarium. In fact, snails can be beneficial for your aquarium. You only need to know which ones to keep and what to avoid.
Ramshorn Snail .:. Planorbis rubrum .:. Freshwater Aquarium Snail Species Information Page
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There are some good reasons as to why you should have a certain few types of snails in your freshwater fish tank. Freshwater aquarium snails are often used in order to clean up debris in fish tanks. They like to eat things like old fish food, algae, and even fish faeces. This means that a fish tank with snails has to be cleaned a lot less than one without snails. Aquarium Snails,Planted Aquarium,Freshwater Aquarium,Aquascaping,Trumpets
Photo provided by FlickrThe ramshorn snail is a common pest in the freshwater aquarium. Pictured is Planorbella trivolvis.
Photo provided by FlickrHorned Nerite Snail .:. Clithon corona .:. Freshwater Aquarium Snail Information Page
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More than a half-dozen species of freshwater snails are available through aquarium stores, ranging from the brilliantly colored blue and pink ramshorn snails to the common apple snail, which can reach 6 inches in diameter. While most species of snail live a year or two in an aquarium environment, their life span depends a great deal upon tank conditions.There are quite a few different kinds of freshwater aquarium snails that you can find for purchase. That being said, there are also quite a few different aquarium snails that might just find their way into your fish tank by accident. Some of the most common types of aquarium snails that can be found are ones such as;Many people decide to get freshwater aquarium snails to accompany their fish, and there is a good reason for it. However it’s not as easy as just picking up the first snails you see and dumping them into the water. Some snails are good, some are bad, and some are just a nuisance. While you often hear hobbyists saying they can't get rid of all the snails in their tank, having snails in your freshwater aquarium as a rule is actually quite beneficial. Most snails act as a "clean up crew" in the aquarium, eating excess food, decaying plant or fish matter, and moving gravel on the tank bottom. The problem with snails in an aquarium is that they reproduce very quickly, and can marr your beautiful tank by being stuck all over the glass and decorations. The real challenge is keeping the snail population in check.Neritidae snails, FW, sel. 7/13/10
Hi, I have been looking for freshwater Neritidae snails. Can you pleasetell me if you handle them or where to get them? Also, in theinformation that I have been able to find about them, some say thatthey will not multiply and others that they will. Which is right?

Consequently these snails aren't easy to breed in captivity. Thereare a very few exceptions, like the European species Theodoxusfluviatilis, that can complete their life cycle in freshwater. But theones you see in pet shops, such as the African zebra Nerite Neritinanatalensis and the Indo-Pacific zebra Nerite Vittina coromandelianawill not breed under aquarium conditions. Cheers,Neale.> Here is a small guide to facilitate to determination of your aquarium freshwater snails.
Please bear in mind that this guide is by no means complete. It's only intended to give a rough overview to help you in the right direction. For more specific information, you should use more specialized literature.