snails are born!

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Does someone know how to tell me when a snaail reproduces him how many small snail do? I had picked ago up a snail for my aquarium a few weeks and she is dead after few days;now from a few days the surprise:I have noticed the presence in the tub of small trasparent hulls in very slow movement...lol!e Does someone have experience of snails of aquarium?How much they can be and how long will they want eus for their growth? Thanks!