03-23-2012, 10:28 AM
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As Boredomb said, snails are one of the aquarist's best friends when it comes to a healthy tank. They get into places we can't and they eat everything organic, breaking it down into smaller bits that the bacteria can more easily handle.
They will populate in proportion to the available food, meaning the waste and other organics. Everything you feed the fish becomes waste obviously, along with other natural organic waste. Don' worry if the snails multiply; it just means they are dealing with stuff you cannot even see.