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Definitely and acute bladder snail. I got a baby one with some duckweed one time. They're super cleaners, eating decaying parts on plants (not live parts) and algae off plants and aquarium glass. They'll skim the surface of the water, breathing air and eating microscopic things floating around. But beware of an invasion! I was convinced that since I got my snail when it was a baby and there was only one that it would never lay fertilized eggs. ...I was wrong! As soon as it matured it started laying egg blobs EVERYWHERE! I had to get it it's own 2 gallon tank and find all the eggs and put them in there so my real 10 gallon aquarium won't be overrun. And as for your questions, these snails very docile (and fast) and won't harm fish, shrimp, or fry.