One more thing I can mention, just haven't dealt with it but once, long ago......when I received a discus shipment once, shipped poorly resulting in ammonia burn to the fins and discus laying flat on the substrate, it was recommended to me to add salt to the water to aid with their respiration. For sure lots of clean water to get those ammonia and nitrite levels down is the most important thing, but i'm wondering if a little salt added to their water would help them breath a little easier. In the case of my discus, although they looked like they would die, kept in the dark tank to rest with salt added, they were up off the bottom the next day, swimming. Anyone have any thoughts on this with the kuhli's with their gills having been a bit damaged right now? And I don't remember how much salt, it wasn't a huge amount.