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Everything I've read on using canine dewormer in tanks warns that it's lethal to any snails left in the tank--and snails should only be reintroduced to a treated tank with great caution as the stuff doesn't naturally break down in the substrate so wc/carbon aren't guaranteed to remove it all.I did treat with Dog Dewormer, a few weeks ago, but I did not have any problems until now. Still no change in all of the snails. I am finding alot of empty shells.