You are adding live fish caught from the ocean. This is an excellent way to bring disease into your system. In addition to the stress, it only takes one paracite to infect a system.
Some snails can tollerate a wide range of salinity and other water conditions. When visiting the New Jersey shore, I've seen snails on the tidal mud flats. They are often out of water at low tide, and often in tidal pools where the water temp can get extreme in the summer.
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