I love mystery snails! Also, a nerite snail.
Alright, that's good to know about the temperature. I was also concerned about them trying to escape because I do not have a super secure lid, so that tip about the horned ones not being escape artists is helpful! My only other concern is that I know you normally feed them tablets or blanched vegetables. My tank doesn't have a lot of algae in it because it is small so I would have to give it something. I don't have access to boiling water (I live in dorms) so I can't blanch vegetables. However, with the algae tablets I am worried that my Betta will try to eat them. My friends Bettas eat her algae tablets the second she drops them in the tank and they get super bloated. I don't know what I could safely (for my betta) feed the snail.Nerites are found in waters round about 78 degrees and up to 86.
80 degrees is perfectly fine and in fact the average temperature in their habitats.
Leave them some algae in the tank or grow your own (boulders or stones in a jar filled with water on the window).
The horned ones won‘t leave the tank.