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Your prerogative. Contrary to some peoples' belief, even "pest" snails don't reproduce like mad unless they have plenty of food. If you're not overfeeding, and there isn't an abundance of algae, dead plant matter, or excess food to dine on, he's not going to reproduce to huge numbers. If you like him, keep him, just be aware of all the things he may find tasty that are in your tank.Shall I remove him.... he's cute and cleaning algae from corners. Hmm?
Yep, it's a bladder snail. I find them adorable and helpful. In my experience, they don't overrun the tank unless there's extra food / algae for them to eat, in which case (imho) they're doing you a favor. They're also a good backup alarm for water quality. They generally don't venture out of the water, so if your bladder snails are above the water line, there's most likely a problem!
I know the small nerites are at risk. Generally speaking, assassins leave the larger ones alone, and I mostly have large ones. There have been stories of assassins ganging up on a larger snail, but I haven't seen it yet. And if it happens, well, I'll deal with that eventuality. Just looking at the odds, hundreds of various pest snails, compared to a couple dozen nerites, the odds are good that the nerites aren't going to get targeted often.Put it in a jar. Leave the jar in a window with sun see how fast they reproduce. Or put the jar on a shelf out of the sun see how fast it reproduces.
Authmal you do know the Assassin snails Will kill your nerites. They eat all snails.