I'm sorry you had to euthanize the 1 discus but at least you were able to help the other. I agree on treating the tank, they probably all have whatever it is. Good luck.
Prazi will help them expell tapeworms which are more string-like.Hex is more jelly -like and is common when a Discus get stressed out for whatever reason and stops eating.
Some fish will have a harder or even cronic problem with Hex even if they are getting a good balanced diet..It may take a long time before they get to the not eating stage.Look at the foreheads if you see pinholes or holes in the heads treat them all with hex.The metro only is active for 8 hours so what you can do is lower the water level to 1/3-1/2 at night(if the filter allows it) then in the morning siphon out the debris on the bottom and fill the tank.Repeat 3-4 days,then it may take the fish another 2-3 days to start eating again.
Prazi will help them expell tapeworms which are more string-like.Hex is more jelly -like and is common when a Discus get stressed out for whatever reason and stops eating.
Some fish will have a harder or even cronic problem with Hex even if they are getting a good balanced diet..It may take a long time before they get to the not eating stage.Look at the foreheads if you see pinholes or holes in the heads treat them all with hex.The metro only is active for 8 hours so what you can do is lower the water level to 1/3-1/2 at night(if the filter allows it) then in the morning siphon out the debris on the bottom and fill the tank.Repeat 3-4 days,then it may take the fish another 2-3 days to start eating again.