Originally Posted by
captainandy
All the domestics have horrible immune systems because they have been inbred for generation upon generation. Most domestics that are healthy can battle moves bacterial infections with a decent immune response. However, virus variety and the ability to kill the host, way outnumber (by magnitudes) all other pathogens.
The best you can do is support them with temps in the mid to high 80's with clean and very well oxygenated water and hope the fish can mount a response before the virus kills it.
Viruses need not be airborne as there are droplets all over the place, including nets, hands, clothing,etc.
Finally, IMO it makes absolutely no sense to add salt. The discus homeostasis (kidney, gills and other organs) came from millions of years of evolution in soft water) and salt can only upset this homeostasis and cause more stress.
Just because many with 1000s of posts recommend salt for discus disease does not make it right. Check a veterinary or ichthyology text an you will not find salt used very often, if at all.