If it is dropsy and you see pine coning it is too late IMO( and a few others!)
There is no real going to work even 50% of the time cure for it!
Further more(and I know most will not like this..BUT);
You may medicate a beloved sick fish if you wish, but
don't return to a community aquarium a fish that has "recovered" from symptoms of bacterial disease once its outward symptoms have been alleviated. "Dropsy" is a case in point. Sometimes a fish recovers enough from a bout of severe ascites to lead an outwardly-normal life. Then the "cured" fish is returned to the community aquarium, where it may become a sub-clinical carrier of bacteria, free of visible symptoms. A sub-clinical carrier remains a source of infection for all your other fish. When it dies quietly among the plants, a couple of months after the episode of "dropsy," the two events may not seem connected. Initial quarantine, even a full four weeks' time, may not be long enough to identify weakened fish that are bacterial carriers before they enter your system. It's quite probable that all your fish have already been exposed to a variety of bacteria that could be pathogenic, given the right circumstances.
Encourage a low-stress environment, to keep immune systems responsive. Keep levels of dissolved organics and metabolic end-products low.
Encourage bacterial diversity in the aquarium. This may be unfamiliar advice. I encourage bacterial diversity in several ways. I add a pint of water drawn from a fish-free plant nursery to each aquarium, from time to time.
I also
vary water temperatures, keeping within comfortable tolerance ranges of the fish, of course; after a couple of months at 77°F, for instance, I might re-set the heater to 74°F for six weeks or so. Why? Well, our constant thermostatically-controlled temperatures favor the success of whatever strains of bacteria are the most ideally-suited to that particular temperature.
Mycobacteria marinum reproduces best in the lab at a steamy 33°C. Varying the temperature may avoid inadvertent culturing of dominant strains of bacteria. Seasonal variation of temperature — within the limits tolerated by the fish — seems to have a protective effect: Dr. H. Reichenbach-Klinke was suggesting in the 1960s (
Diseases of Fishes, TFH, 1965, p. 23), "Obviously the adaptability of the fish has to be considered, but attempts to protect them by varying their temperature seem to be well worth while." I think we've ignored this sound old-fashioned advice, which I first read in William T. Innes'
Exotic Aquarium Fishes. As far as tropical fishes are concerned, the difference between surface waters in a slow-moving stream at dawn and at mid-afternoon may be as great as any seasonal differences. "Night is the winter of tropical waters," I recently read.
Taken from
Bacterial infections | The Skeptical Aquarist
sorry!
now IMO I don't see pine coning.
Could the bow be carrying eggs?
many disease will have separation as a symptom and good for you seeing it,but some fish hide like some fish itch?
Your water parameters seem outstanding IMO!
if it is dropsy remove fish asap.
