I am going through a bad case of diarrhea right now with one of my guys. It sounds like one (or more) of them needs some metronidazole to treat the diarrhea. One way to find out who the "culprit" is try isolating them. I hve discovered the best time to do this is when everyone is eating (put them in different rooms). Most cats go to the litterbox shortly after eating (or at least mine do).
Good luck in finding out who it is.
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