They can breed in freshwater.I have been looking into getting some mystery snails lately. Do they breed in freshwater? I have only ever kept MTS, BRH, and Nerite snails.
They seem to have a lot of personality.
BUT. You will find their eggs above the water line, they cant survive submerged. So you could easily remove them if you dont want babies. Theyre fairly large egg masses usually laid on the lid of the tank.
Or, you could remove and hatch in a humid tank if you didnt want them to hatch in the main tank...
Sexing them isnt the easiest.
Hardest issue with mysteries is buying them and them actually being mysteries and not apple snails by mistake lol