Hmm, well that all looks ok providing that the nitrate is that and not nitrite. I don't expect you would have high nitrite after this long but I did ask for nitrIte and not nitrAte. You haven't done anything crazy lately like scrub out the filter or change the gravel have you?
Sounds more like some disease :(
I'm even wondering if it is age although I doubt it. The fact that Wade died from dropsy doesn't help us much because even old fish can die from dropsy as a result of old age and deteriorating immune system.
How long has this been going on? Is it just recent ?
If it is a disease then it must be one of those horrid lurking things like fish TB or hexamita, the sort of thing the fish can live with until something goes a little awry and it blows out.
If it were my fish I would increase water changes and wait and see if any disease symptoms show their ugly face. Not a lot else you can do apart from dumping heaps of chemicals and drugs into the water.
Good Luck!
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