Your point of living?

[Athene]

The Bettas I had were all pretty indifferent to the goings on of everything else in the tank, they would sit in the trees (plants) all day doing nothing.
The Cardinal Tetras are far prettier than the Neons. 

Snails? You had better make sure they are Adam & Steve not A&E or your tank will be overrun in no time.

Snails are hermaphrodites, I think. If I get two freshwater snails, they'll have to be of different species to ensure my tank doesn't become Snail Central. The gravel dwellers are good for taking care of excess food particles, and of all of them love algae.
They'll help keep the tank clean, and Bettas and snails don't bother each other at all. They make great tank companions.

Btw, how big was/is your tank? It sounds pretty live.