When I combined my discus tanks and rehoused the remaining discus together, one of my discus stopped eating.

Since frozen worms did not get the fish back to eating I added salt and raised the tank to 90 F. Took about two weeks (only replaced the salt once during WC) but the discus is now eating well.

While this may be coincidence or due to other factors, still, the process once again appears to have worked.