....apple snails, reproduce often? No way. lol. They are unlike the more common snails, that are the pest snails. Apple snails need a partner to reproduce as they are separate genders! Even then it's easy to scoop out the egg nest (above waterline is where they have it) if you did not want them...
Depending on your betta an apple snail is perfect. some make smaller snails an attempted snack... My Madame murdered my snail, but any of my other bettas never cared for him. Snails will eat leftover food, algae... you can get algae wafers for them, or a soft piece of vegetable.
The size of the tank is good for those two :)
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.