It looks like its making a come back. Hows it look now? On a side note if you try and take the nem out and cant get it off the rock leave it alone. if it were dying/dead it wouldnt still be holding on.
It looks a lot better! If it ever gets to the point that it is getting white chunks coming off of it and it releases from the rock, that is when I would give up on it. It won't harm your tank until it starts to degrade