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Its 2 inch big thoughIt looks like a type of nerite snail - there are several species though I suppose strictly speaking nerites should be in the genus Neritina. But I can't explain how it got there as the eggs need to be in salt water to hatch and develop.
Do a search for images of nerite snail and see if yours matches one of them.
Just contacted the seller they said it is a “black military helmet snail”You might also need to research snails which are native to your country as it could have got in from outside somehow.
Does it eat algae?That is a type of nerite, Neritina pulligera
Will it breed like pond snail?That is a type of nerite, Neritina pulligera