09-09-2010, 02:54 PM
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Responding to last three posts.
The small snails regularly seen in our tanks, that usually arrive with plants or sometimes wood, do not eat healthy plants. They will eat dying plant matter, any decaying fish or fish food, algae (to some extent, don't expect a few snails to keep your tank free of algae, but they will eat it), fish waste. And Malaysian livebearing snails are excellent because they burrow through the substrate--which with sand is a real bonus--keeping it aerated and healthy.
The Malaysian livebearer snail, as the name implies, bears live young (and without male/female copulation, each snail apparently is "female" and just produces offspring). All other small snails lay eggs; you will often see tiny clusters of gelatin-like patches on leaves or the tank wall, those are snail eggs. I would leave the snails in the fish tank, they will reproduce fine in there, everything they need is at hand. Plus they do all that cleaning work for you.