The controllable snails youíll most likely find are going to be mystery and nerite. Yes, mystery can reproduce, but only in gender pairs. Get one, and youíre set. Nerites are the same way - boys and girls.
If you get more than one and they breed, mysteries lay a clutch of eggs you can easily remove (and hatch separately, add to another tank, share with friends, sell to others, feed to puffers, etc.).
Nerites stick their eggs to things, and they can be difficult to remove. In freshwater, they arenít viable.
Iíve found mysteries to be more robust. Both do a great job of scouring all surfaces. They have different looks, up to you to decide what you like to see. Please make sure they are fed - especially in a new tank.
One last thing: mystery snails can do some freeform swimming, including on the top water surface, and drop from upper areas down to the bottom. They can flip themselves over. Nerites can not flip themselves, and do not leave surfaces - though theyíre amazing climbers. When adding, please place a nerite on its foot, and donít just throw it in the tank. Itís a pet peeve of mine - told my local pet store folks many times, they ignore me, have lots of dead snails, and no idea (or care) why.
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I can only grow plants when they're completely under water. Everything else is doomed.