Welcome to the watery world of fish and invert keeping!
You can raise the snails for the puffers ( if they are alive). The crunching of the shells is good for the Puffers.
You should see the RH snails gliding around at some point, or possibly the Puffers ate them already.
You can pic some out of the tank and look inside the shell opening. Does the shell look like there is a snail inside?
You can keep a separate tank for the raising of snails. Or meet someone who has too many pest snails and wants to sell them because they are too plentiful.