Hi!
Those look like tiny white flatworms to me, NOT snails, IMHO.
For the MOST part they are harmless, Butterflyfish love them (my Pakistani Butterfly does, anyway). Some of these MIGHT chomp on soft corals, but THAT is uncommon....
Always when you get ;something to eat something' you have to plan ahead. Wrasses will but wrasses can be a pain to tankmates. So can chemical treatments. Give us info about size of tank, age, intended fish, inverts and corals and we can be a bit more help.
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