There is a difference in the eating habits of these snails and nerites. My ramshorns will eat anything but nerites eat mostly algae and bio-film. They may eat algae wafers if there is nothing else to eat but I wouldn't depend on them surviving on algae wafers alone.
Unless you really want bladder snails in this tank I wouldn't recommend you test out your bettas temperament by adding any. Once in there it is often difficult to get all of them back out. It might be better to just leave them in your pond.
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Yes of course I’m going to monitor them to make sure he doesn’t harm the snailI don't want to be a negative nelly but one of my Bettas nearly killed a nerite snail by attacking it. I know a lot of people keep them together fine, and my other Betta is super chill and fine with the pest snails in his tank. But Ben is a grumpy git and will attack anything from a pest snail to my hand if I put it in the tank. (Which is adorable
*Edited to add my point... I'd keep a close eye when you first put them in for any aggressive behaviour.
