If after tetracycline treatment it came back I would have to think they are doing it to themselves. Which isn't at all uncommon in males. They may be doing it at night when no ones looking. But still seems awfully coincidental that the two males you happened to get would both be doing it. ![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)