another look at this you have many know to be territorial fish in a small for adult size tank. Any maygor rearangment of the decor of the tank could cause several turf wars that a high fin synodontis would probably lose in.
Also you could have had a major methane release. This you be untest able for you. solved with water changes
Also you could have had a major methane release. This you be untest able for you. solved with water changes
