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I suspect something in the water. Time to do a big water change IMO and bring your water in to a local LFS for an extensive test if you don't have a good testing kit at home.
Also when you added in the inverts, did you drip acclimate them? Did you make sure the salt gravity was the same? Snails are actually pretty sensitive to water changes like most inverts are. Most people don't drip or float them but they also end up getting a lot of die off and it doesn't happen right away. Sometimes it takes a week.
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