Had a discus that was injured. Appeard to "grow" fungus around the injury. Wasn't able to remove injured fish til yesterday. It died today. Question that may be related to the injured/dead discus. After the injury the fish developed what looked like, maybe, fungus around the wound. I now have a "film" on the inside of my tank with the other 5 discus. All were very healthy a couple of days ago and now these are staying in one corner. I did about a 30% water change today. Anything you can think of that might cause the film on the inside of the tank and bothering the remaining fish?
As I recall all 5 fish looked good this morning.
Treatment?