I think if it was vent gleet their vent would be damaged, your initial post says it is below the vent. Also vent gleet is non contagious so I am not sure why you would have multiple cases at once.
Have you ever wormed them? I would start there. There are many great articles about wormers on this site you can search for. It is spring and things are waking up, including parasites.
Have you ever wormed them? I would start there. There are many great articles about wormers on this site you can search for. It is spring and things are waking up, including parasites.
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