<https://kokosgoldfish.invisionzone.com/topic/76059-unsure/#comment-848816>
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"Depending on what kind of snails you get depends on how long you have to quarantine them.  I found after researching ramshorn snails that they are able to carry various parasitic flukes, which can be transmitted to fish, or humans. Most of these flukes require intermediate hosts, so that leaving the snails by themselves for a month or so will eliminate the disease.  I found out ,after wondering why one of my puffers (the one that was the only one to eat those snails) was always thin after feeding even after eating blood worms.  I wormed my fish and he's been fine ever since. "
<https://kokosgoldfish.invisionzone.com/topic/76059-unsure/?tab=comments#comment-848927>