My fish Zeus probably bit his tail pretty badly he had some splits but I got up two days ago to a fish with a lot of tail missing. I think some recent changes I made around his tank caused this. I had Perseus nearby and I moved him I didn't think he could see because he was on a higher surface than him. I also made lighting changes. I preparing an new tank set up so I am moving things/fish as needed.
I don't think he has fin rot yet but I am concerned it will evolve into that. I have a 5 gallon for him but I am wondering if there is any fin rot bacteria if it will move with the filter to the new tank. I am treating with AQ salt and doing water changes.
BTW I asked this question in habitat but I didn't get much of a response so I am reposting here.