Update:
The Oscar is still alive. Been Treating the tank for about 5 days and not sure what to make of the results. The Oscar is showing an appetite and eating when I feed, although he spits everything he eats. He spits so much, I am not sure how much he is actually swallowing. Tonight, I noticed he was clamping his dorsel fin, which is a new symptom. I decided to do a 50%
PWC, but no major change yet. A few days ago, he was looking much better, even showing some occassional aggression with the Convict. Between the food spitting and clamped fins though, I have some serious doubts about whether or not things are progressing like I hoped. Any thoughts after reading this update?
All other fish in the tank are still very lively and showing no signs of disease or stress.