04-30-2009, 09:47 AM
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Boiling rocks may cause them to explode (as some other posters on this forum have indicated), not sure if baking will do the same, but it is not necessary. Washing in very hot water with a scrub brush would remove anything on the surface like parasites which is all that really matters, and snail eggs, although I doubt this is how they arrived; plants, as someone suggested, is the usual carrier. Washing plants carefully in water with your fingertips will remove smail eggs and tiny snails, assuming the leaves are large enought to make this feasible.
Mystery snails can get large and I have not seen them recommended for basic tank snails. They also contribute to the bioload, and the bigger they are...
Good normal snails in aquaria are Malaysian livebearer (sometimes called trumpet or horn of plenty snails because they are long and ridged like a horn of plenty) that burrow throughout the substrate keeping it cleaner and less chance of anaerobic conditions than otherwise, and the common pond snails will graze leaves and everything for algae and uneaten food. All snails will reproduce (unless the water is too soft and acidic, because they lack the necessary calcium for their shells) but will remain within manageable limits provided the tank is properly maintained and they don't have more food than what they can find. A population of snails within reason is another sign of a healthy aquarium.