So I decided to go with
Olive Nerite snails instead of Apple snails. The main reason is because my local fish store (lfs) carries them. The other is that I was searching them online and it seems they are
very good algae eaters (what I needed) and they
won't eat my live plants. I don't know about the apple snails eating plants but didn't want to chance it. Plus the Nerites are smaller and less likely to be seen as a threat by my Bettas. I think.
So my questions are: I have my 6 snails in a quarantine container but want to move them to the tanks soon. I watched the lfs owner careful pluck them off the glass of tanks, but I worry about using this method to move them. I don't want to accidentally damage their really fragile antennae, rip their feet, or pull their shells off their backs in the process. I have tried just pulling them off the glass but they seem to be glued on (or I am not pulling hard enough?).
Is there an easy way to safely move them? I have heard of putting cucumber in the tank and waiting for them to crawl onto it but what about zucchini? I don't think I have any cucumber in the house but know I have zucchini. I also have another question for when I get them in the tank.
Will they be okay during water changes if they get above the water level? Will they just hold their breath?
Here is a cool thing about Nerite snails that I learned: They can't breed in freshwater!

Apparently they can only breed in brackish water. The owner of my lfs showed me a 6 gallon tank with some tiny Rasboras and some of the olive nerite snails. There were these tiny white eggs on the sides of the glass. He said that after a while they disappear but he doesn't think they are being eaten because there is a small outline of where they were. His hypothesis is that they hatch but die because they can't find anything to eat or the water parameters aren't right. This is interesting because most commercial retailers of the snails get them from the wild because no-one can really determine how they breed or more specifically how to keep the larval form alive. Figuring out how to breed them would be a cool project!