I just used snail bait on top of the sphagnum moss mine are in. While the bit seems to mold up and get fuzzy and colored, I just spray with fungicide and it kills the problem, but the natural stuff I got has iron in it and it doesn't hurt the plants. Those snails are awful though, and will devour anything they can put their sticky slimy foot on- I have even had them infest my orchids and clean out new healthy roots and even the small shoots coming off pseudobulbs- so kill them all and check the medium for more cuz in my experience, if the medium is moist they will multiply in it like crazy and take down a good sized plant in no time.
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