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What med did you use ? If it was copper based, you may have a problem. It's hard to get rid of copper based meds and copper is highly toxic to inverts.
I would do 2 water changes before you add them back in, and at the second one toss the old med'd up filter pads. I had the same thing happen, snails and frogs, in a jar on my coffee table for 3 weeks. Everyone did just fine.