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I couldn't find your old question either, even though I found a number of your other old questions. Very odd.
As long as Bing is eating, I don't believe he is suffering. Appetite loss is usually the first thing we see if a fish is in pain or extremely uncomfortable. And since the others are not picking on him, for now I would just leave him alone.
Signs that he may be in distress would be refusal to eat, lying on his side, inability to swim to the top, or gasping for air. If you see any of those, it would be time to humanely end his suffering.
You're welcome. I was hoping for a better outcome for Bing, but it wasn't to be. I'm so sorry for your loss.