So one of my friends has a frog that they caught in the pond, and she just put pond scum and leaves and all of that crap in a bowl.

Well, apparently, she has a pond snail that came with the scum, and I asked her If I could keep one for my fish.
Can I keep it in Lucky's tank to eat algea? The snail can fit in an area smaller than your pinky nail.
Thoughts?