An apple snail is called an apple snail probably because they can grow the size of an apple, I had a Mystery snail in my 20g community tank and he did well for a while but eventually died too early for how long he should've lived for. I am not adding another snail to my tank because I don't want to have that happen again since I obviously can't meet the needs of a snail. We have a resident snail expert on the forum here sometimes that has said what dramaqueen mentioned.
wow one snail in a 20ga and it died? that is not your fault, must have just been a sick snail or something. 20 gal is MORE than enough room for one snail. And i know why it's called an apple snail haha i purchased my 6 from a breeder in person and she has breeding them for a long time. She had 2 that where the sized of apples!
You can put an applesnail in the tank,
Why not, it's your choice,
But from experience with applesnails It will die in a short while.
Some die almost instantly some may even go so far as to live a few months,
Applsnails need stability in their environment.
a 1 gallon tank is anything but stable, it just won't work long term for an applesnail,
Cuttlebones work good as a form of calcium. I keep them floating in the tops of all my snail tanks.