not eating

[dogday7]

I have a pair of 9 month old discus in a 25 gal tank.
I noticed 4 days ago that one was not eating. It seems to be fine
comes to the front with the other when i come into the room.
But it is not eating, it will come and look at the food and swim away.
I gave it a salt bath 3 day ago, (2 tbls per gal.) and started using
Prazi pro. The water is all fine, and do a 50% water change per day. Any sugestions???
ty, John

[Ardan]

What is the temp?
Also check for ammonia and nitrite.

Any other changes? Water, additives, filter....
Why the salt bath?
Ardan